RANKING · Q2 2026

Largest net interest margin improvement in Massachusetts

90 of 94 banks in Massachusetts that filed for the quarter ended June 30, 2026 are ranked. At least $100 million in total assets and a comparable quarter a year earlier. Institutions with equal values share a rank. Source: FDIC quarterly financial data.

Largest net interest margin improvement in Massachusetts, Q2 2026
Rank	Institution	Headquarters	Net interest margin, change over 12 months	Total assets
1	Walpole Co-Operative Bank	Walpole, MA	+83 bps	$646 million
2	Cornerstone Bank	Spencer, MA	+74 bps	$2.6 billion
3	Canton Co-Operative Bank	Canton, MA	+58 bps	$155 million
4	Avidia Bank	Hudson, MA	+53 bps	$2.8 billion
5	The Village Bank	Newton, MA	+53 bps	$2.1 billion
6	Watertown Savings Bank	Watertown, MA	+51 bps	$1.4 billion
7	Middlesex Savings Bank	Natick, MA	+51 bps	$6.1 billion
8	Baycoast Bank	Swansea, MA	+51 bps	$2.9 billion
9	Hingham Institution for Savings	Hingham, MA	+50 bps	$4.6 billion
10	Bay State Savings Bank	Worcester, MA	+48 bps	$580 million
11	Rollstone Bank & Trust	Fitchburg, MA	+47 bps	$816 million
12	Seamens Bank	Provincetown, MA	+47 bps	$478 million
13	Leader Bank N.A.	Arlington, MA	+46 bps	$5.3 billion
14	Reading Co-Operative Bank	Reading, MA	+46 bps	$1.2 billion
15	Lee Bank	Lee, MA	+45 bps	$591 million
16	Rockland Trust Company	Rockland, MA	+45 bps	$25.0 billion
17	Martha'S Vineyard Bank	Edgartown, MA	+44 bps	$1.3 billion
18	Beacon Bank & Trust	Brookline, MA	+43 bps	$22.2 billion
19	Cape & Coast Bank	Yarmouth Port, MA	+43 bps	$1.7 billion
20	Savers Co-Operative Bank	Southbridge, MA	+42 bps	$783 million
21	Stonehambank	Stoneham, MA	+41 bps	$918 million
22	Bankgloucester	Gloucester, MA	+39 bps	$387 million
23	Dean Co-Operative Bank	Franklin, MA	+38 bps	$494 million
24	Cape Ann Savings Bank	Gloucester, MA	+38 bps	$1.1 billion
25	Webster Five Cents Savings Bank	Webster, MA	+38 bps	$1.3 billion
26	Bankesb	Easthampton, MA	+37 bps	$2.0 billion
27	Everett Co-Operative Bank	Everett, MA	+37 bps	$1.7 billion
28	Fall River Five Cents Savings Bank	Fall River, MA	+36 bps	$1.9 billion
29	Country Bank for Savings	Ware, MA	+35 bps	$2.2 billion
30	Haverhill Bank	Haverhill, MA	+34 bps	$637 million
31	Washington Savings Bank	Lowell, MA	+33 bps	$302 million
32	Mechanics Cooperative Bank	Taunton, MA	+32 bps	$899 million
33	Wrentham Co-Operative Bank	Wrentham, MA	+32 bps	$193 million
34	Fidelity Co-Operative Bank	Leominster, MA	+31 bps	$1.3 billion
35	North Shore Bank, A Co-Operative Bank	Peabody, MA	+30 bps	$3.3 billion
36	The Cooperative Bank	Roslindale, MA	+30 bps	$548 million
37	East Cambridge Savings Bank	Cambridge, MA	+30 bps	$1.7 billion
38	Bank of Easton	North Easton, MA	+30 bps	$249 million
39	Dedham Institution for Savings	Dedham, MA	+28 bps	$2.6 billion
40	Main Street Bank	Marlborough, MA	+28 bps	$1.7 billion
41	North Easton Savings Bank	South Easton, MA	+27 bps	$1.8 billion
42	Millbury National Bank	Millbury, MA	+27 bps	$147 million
43	Winchester Savings Bank	Winchester, MA	+27 bps	$1.1 billion
44	Pittsfield Co-Operative Bank	Pittsfield, MA	+25 bps	$452 million
45	Winchester Co-Operative Bank	Winchester, MA	+25 bps	$947 million
46	Pentucket Bank	Haverhill, MA	+25 bps	$1.1 billion
47	Adams Community Bank	Adams, MA	+25 bps	$1.0 billion
48	Onelocal Bank	Norwood, MA	+24 bps	$1.1 billion
49	National Grand Bank of Marblehead	Marblehead, MA	+24 bps	$445 million
50	Westfield Bank	Westfield, MA	+23 bps	$2.7 billion
51	North Brookfield Savings Bank	North Brookfield, MA	+23 bps	$449 million
52	Needham Bank	Needham, MA	+21 bps	$7.4 billion
53	Bristol County Savings Bank	Taunton, MA	+21 bps	$3.3 billion
54	Coastal Heritage Bank	Weymouth, MA	+20 bps	$984 million
55	Methuen Co-Operative Bank	Methuen, MA	+20 bps	$141 million
56	Monson Savings Bank	Monson, MA	+20 bps	$806 million
57	Newburyport Five Cents Savings Bank	Newburyport, MA	+20 bps	$1.6 billion
58	Stoughton Co-Operative Bank	Stoughton, MA	+19 bps	$135 million
59	Clinton Savings Bank	Clinton, MA	+19 bps	$745 million
60	Institution for Savings in Newburyport and Its Vicinity	Newburyport, MA	+18 bps	$5.6 billion
61	Eagle Bank	Everett, MA	+17 bps	$709 million
62	Salem Five Cents Savings Bank	Salem, MA	+17 bps	$8.8 billion
63	Charles River Bank	Medway, MA	+17 bps	$336 million
64	Northern Bank & Trust Company	Woburn, MA	+16 bps	$3.4 billion
65	Florence Bank	Florence, MA	+16 bps	$2.0 billion
66	Winter Hill Bank FSB	Somerville, MA	+16 bps	$408 million
67	Marblehead Bank	Marblehead, MA	+16 bps	$263 million
68	Unibank for Savings	Whitinsville, MA	+15 bps	$3.1 billion
69	State Street Bank and Trust Company	Boston, MA	+15 bps	$413 billion
70	Cape Cod Five Cents Savings Bank	Hyannis, MA	+14 bps	$5.6 billion
71	South Shore Bank	South Weymouth, MA	+11 bps	$2.5 billion
72	Greenfield Co-Operative Bank	Greenfield, MA	+10 bps	$902 million
73	The Lowell Five Cent Savings Bank	Tewksbury, MA	+10 bps	$1.9 billion
74	Cambridge Savings Bank	Cambridge, MA	+10 bps	$7.0 billion
75	Greenfield Savings Bank	Greenfield, MA	+10 bps	$1.5 billion
76	Milford Federal Bank	Milford, MA	+9 bps	$545 million
77	Mountainone Bank	North Adams, MA	+8 bps	$1.1 billion
78	Bankhometown	Oxford, MA	+8 bps	$1.6 billion
79	Eastern Bank	Boston, MA	+7 bps	$31.1 billion
80	Commonwealth Cooperative Bank	Hyde Park, MA	+5 bps	$205 million
81	Bluestone Bank	Raynham, MA	0 bps	$1.6 billion
82	The Savings Bank	Wakefield, MA	-6 bps	$891 million
83	Peoplesbank	Holyoke, MA	-9 bps	$4.6 billion
84	Oneunited Bank	Boston, MA	-18 bps	$638 million
85	The Bank of Canton	Canton, MA	-21 bps	$783 million
86	Mutualone Bank	Framingham, MA	-24 bps	$1.2 billion
87	Computershare Trust Company N.A.	Canton, MA	-26 bps	$1.0 billion
88	New Valley Bank & Trust	Springfield, MA	-65 bps	$385 million
89	42 North Private Bank	Canton, MA	-86 bps	$182 million
90	Middlesex Federal Savings F.A.	Somerville, MA	-110 bps	$654 million

Rankings sort one published measure; they are not an overall judgment of any institution. Methodology · All rankings