RANKING · Q2 2026

Highest net interest margin 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. Institutions with equal values share a rank. Source: FDIC quarterly financial data.

Highest net interest margin in Massachusetts, Q2 2026
Rank	Institution	Headquarters	Net interest margin	Total assets
1	Millbury National Bank	Millbury, MA	5.05%	$147 million
2	Northern Bank & Trust Company	Woburn, MA	5.01%	$3.4 billion
3	Computershare Trust Company N.A.	Canton, MA	4.60%	$1.0 billion
4	North Shore Bank, A Co-Operative Bank	Peabody, MA	4.47%	$3.3 billion
5	Mechanics Cooperative Bank	Taunton, MA	4.37%	$899 million
6	Fidelity Co-Operative Bank	Leominster, MA	4.33%	$1.3 billion
7	Marblehead Bank	Marblehead, MA	4.05%	$263 million
8	Rockland Trust Company	Rockland, MA	3.99%	$25.0 billion
9	Seamens Bank	Provincetown, MA	3.98%	$478 million
10	Needham Bank	Needham, MA	3.96%	$7.4 billion
11	Walpole Co-Operative Bank	Walpole, MA	3.91%	$646 million
12	Bankgloucester	Gloucester, MA	3.90%	$387 million
13	Beacon Bank & Trust	Brookline, MA	3.89%	$22.2 billion
14	Webster Five Cents Savings Bank	Webster, MA	3.83%	$1.3 billion
15	Mountainone Bank	North Adams, MA	3.81%	$1.1 billion
16	Bankhometown	Oxford, MA	3.79%	$1.6 billion
17	The Lowell Five Cent Savings Bank	Tewksbury, MA	3.79%	$1.9 billion
18	Lee Bank	Lee, MA	3.77%	$591 million
19	Avidia Bank	Hudson, MA	3.70%	$2.8 billion
20	Onelocal Bank	Norwood, MA	3.67%	$1.1 billion
21	Eastern Bank	Boston, MA	3.66%	$31.1 billion
22	The Bank of Canton	Canton, MA	3.63%	$783 million
23	Monson Savings Bank	Monson, MA	3.53%	$806 million
24	Country Bank for Savings	Ware, MA	3.52%	$2.2 billion
25	Baycoast Bank	Swansea, MA	3.51%	$2.9 billion
26	Eagle Bank	Everett, MA	3.50%	$709 million
27	Bristol County Savings Bank	Taunton, MA	3.44%	$3.3 billion
28	Bay State Savings Bank	Worcester, MA	3.40%	$580 million
29	Reading Co-Operative Bank	Reading, MA	3.39%	$1.2 billion
30	Charles River Bank	Medway, MA	3.37%	$336 million
31	Bankesb	Easthampton, MA	3.35%	$2.0 billion
32	Mutualone Bank	Framingham, MA	3.35%	$1.2 billion
33	Dean Co-Operative Bank	Franklin, MA	3.32%	$494 million
34	Canton Co-Operative Bank	Canton, MA	3.31%	$155 million
35	Greenfield Co-Operative Bank	Greenfield, MA	3.27%	$902 million
36	Cornerstone Bank	Spencer, MA	3.27%	$2.6 billion
37	Methuen Co-Operative Bank	Methuen, MA	3.21%	$141 million
38	Savers Co-Operative Bank	Southbridge, MA	3.19%	$783 million
39	Martha'S Vineyard Bank	Edgartown, MA	3.18%	$1.3 billion
40	North Easton Savings Bank	South Easton, MA	3.18%	$1.8 billion
41	Watertown Savings Bank	Watertown, MA	3.15%	$1.4 billion
42	Pittsfield Co-Operative Bank	Pittsfield, MA	3.14%	$452 million
43	Unibank for Savings	Whitinsville, MA	3.12%	$3.1 billion
44	Westfield Bank	Westfield, MA	3.09%	$2.7 billion
45	Cape & Coast Bank	Yarmouth Port, MA	3.08%	$1.7 billion
46	Stonehambank	Stoneham, MA	3.08%	$918 million
47	Greenfield Savings Bank	Greenfield, MA	3.07%	$1.5 billion
48	Main Street Bank	Marlborough, MA	3.05%	$1.7 billion
49	North Brookfield Savings Bank	North Brookfield, MA	3.03%	$449 million
50	Stoughton Co-Operative Bank	Stoughton, MA	2.97%	$135 million
51	Clinton Savings Bank	Clinton, MA	2.96%	$745 million
52	Dedham Institution for Savings	Dedham, MA	2.94%	$2.6 billion
53	The Cooperative Bank	Roslindale, MA	2.94%	$548 million
54	Florence Bank	Florence, MA	2.93%	$2.0 billion
55	Newburyport Five Cents Savings Bank	Newburyport, MA	2.91%	$1.6 billion
56	South Shore Bank	South Weymouth, MA	2.89%	$2.5 billion
57	Coastal Heritage Bank	Weymouth, MA	2.87%	$984 million
58	Commonwealth Cooperative Bank	Hyde Park, MA	2.86%	$205 million
59	Pentucket Bank	Haverhill, MA	2.85%	$1.1 billion
60	Cape Cod Five Cents Savings Bank	Hyannis, MA	2.83%	$5.6 billion
61	Cape Ann Savings Bank	Gloucester, MA	2.82%	$1.1 billion
62	Cambridge Savings Bank	Cambridge, MA	2.82%	$7.0 billion
63	Middlesex Savings Bank	Natick, MA	2.81%	$6.1 billion
64	Peoplesbank	Holyoke, MA	2.79%	$4.6 billion
65	Middlesex Federal Savings F.A.	Somerville, MA	2.78%	$654 million
66	Adams Community Bank	Adams, MA	2.76%	$1.0 billion
67	Haverhill Bank	Haverhill, MA	2.75%	$637 million
68	Washington Savings Bank	Lowell, MA	2.74%	$302 million
69	The Village Bank	Newton, MA	2.71%	$2.1 billion
70	East Cambridge Savings Bank	Cambridge, MA	2.71%	$1.7 billion
71	Leader Bank N.A.	Arlington, MA	2.71%	$5.3 billion
72	The Savings Bank	Wakefield, MA	2.70%	$891 million
73	Winchester Savings Bank	Winchester, MA	2.70%	$1.1 billion
74	Winter Hill Bank FSB	Somerville, MA	2.70%	$408 million
75	Milford Federal Bank	Milford, MA	2.68%	$545 million
76	Salem Five Cents Savings Bank	Salem, MA	2.65%	$8.8 billion
77	New Valley Bank & Trust	Springfield, MA	2.64%	$385 million
78	Fall River Five Cents Savings Bank	Fall River, MA	2.62%	$1.9 billion
79	National Grand Bank of Marblehead	Marblehead, MA	2.54%	$445 million
80	Bluestone Bank	Raynham, MA	2.48%	$1.6 billion
81	Everett Co-Operative Bank	Everett, MA	2.47%	$1.7 billion
82	Winchester Co-Operative Bank	Winchester, MA	2.29%	$947 million
83	Oneunited Bank	Boston, MA	2.28%	$638 million
84	Bank of Easton	North Easton, MA	2.23%	$249 million
85	Wrentham Co-Operative Bank	Wrentham, MA	2.16%	$193 million
86	Hingham Institution for Savings	Hingham, MA	2.14%	$4.6 billion
87	Rollstone Bank & Trust	Fitchburg, MA	2.02%	$816 million
88	Institution for Savings in Newburyport and Its Vicinity	Newburyport, MA	1.34%	$5.6 billion
89	State Street Bank and Trust Company	Boston, MA	1.25%	$413 billion
90	42 North Private Bank	Canton, MA	0.89%	$182 million

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