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SECURITIES AVAILABLE FOR SALE (Tables) | 12 Months Ended
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Dec. 31, 2024
SECURITIES AVAILABLE FOR SALE |
Summary of Securities Available for Sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value | ​ | Allowance
December 31, 2024 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Obligations of US Government-sponsored enterprises | ​ | $ | 1,344 | ​ | $ | — | ​ | $ | (26) | ​ | $ | 1,318 | ​ | $ | —
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
US Government-sponsored enterprises | ​ | ​ | 208,818 | ​ | ​ | 22 | ​ | ​ | (31,524) | ​ | ​ | 177,316 | ​ | ​ | —
US Government agency | ​ |  | 115,177 | ​ |  | 53 | ​ |  | (11,314) | ​ |  | 103,916 | ​ | ​ | —
Private label | ​ |  | 40,633 | ​ |  | 25 | ​ |  | (1,094) | ​ |  | 39,564 | ​ | ​ | —
Obligations of states and political subdivisions thereof | ​ |  | 116,421 | ​ |  | 5,564 | ​ |  | (16,533) | ​ |  | 105,452 | ​ | ​ | —
Corporate bonds | ​ |  | 100,923 | ​ |  | 290 | ​ |  | (7,761) | ​ |  | 93,452 | ​ | ​ | (568)
Total securities available for sale | ​ | $ | 583,316 | ​ | $ | 5,954 | ​ | $ | (68,252) | ​ | $ | 521,018 | ​ | $ | (568)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value | ​ | Allowance
December 31, 2023 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | ​ | ​
Debt securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | ​ | ​
Obligations of US Government-sponsored enterprises | ​ | $ | 2,021 | ​ | $ | — | ​ | $ | (29) | ​ | $ | 1,992 | ​ | $ | —
Mortgage-backed securities and collateralized mortgage obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | ​ | ​
US Government-sponsored enterprises | ​ | ​ | 223,602 | ​ | ​ | 12 | ​ | ​ | (30,332) | ​ | ​ | 193,282 | ​ | ​ | —
US Government agency | ​ |  | 85,005 | ​ |  | 145 | ​ |  | (10,937) | ​ |  | 74,213 | ​ | ​ | —
Private label | ​ |  | 60,888 | ​ |  | 18 | ​ |  | (1,855) | ​ |  | 59,051 | ​ | ​ | —
Obligations of states and political subdivisions thereof | ​ |  | 119,857 | ​ |  | 4,515 | ​ |  | (14,204) | ​ |  | 110,168 | ​ | ​ | —
Corporate bonds | ​ |  | 105,552 | ​ |  | 19 | ​ |  | (9,703) | ​ |  | 95,868 | ​ | ​ | —
Total securities available for sale | ​ | $ | 596,925 | ​ | $ | 4,709 | ​ | $ | (67,060) | ​ | $ | 534,574 | ​ | $ | —
Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) Securities, Segregated by Contractual Maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for sale
(in thousands) |  | Amortized Cost |  | Fair Value
Within 1 year |  | $ | 3,000 | ​ | $ | 2,618
Over 1 year to 5 years | ​ |  | 52,398 | ​ |  | 48,177
Over 5 years to 10 years | ​ |  | 44,527 | ​ |  | 42,074
Over 10 years | ​ |  | 118,763 | ​ |  | 107,353
Total bonds and obligations | ​ |  | 218,688 | ​ |  | 200,222
Mortgage-backed securities and collateralized mortgage obligations | ​ |  | 364,628 | ​ |  | 320,796
Total securities available for sale | ​ | $ | 583,316 | ​ | $ | 521,018
Schedule of Gains and Losses from Sale of AFS Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Proceeds from Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | of Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Available for Sale |  | Realized Gains |  | Realized Losses |  | Net
2024 | ​ | $ | 3,000 | ​ | $ | 50 | ​ | $ | — | ​ | $ | 50
2023 | ​ | ​ | 2,000 | ​ | ​ | 34 | ​ | ​ | — | ​ | ​ | 34
2022 | ​ |  | 7,130 | ​ | ​ | 151 | ​ | ​ | (98) | ​ | ​ | 53
Schedule of Securities with Unrealized Losses, Segregated by the Duration of Continuous Unrealized Loss Positions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than Twelve Months | ​ | Over Twelve Months | ​ | Total
​ | ​ | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
December 31, 2024 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of US Government-sponsored enterprises | ​ | $ | 2 | ​ | $ | 707 | ​ | $ | 24 | ​ | $ | 611 | ​ | $ | 26 | ​ | $ | 1,318
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | ​ | 109 | ​ | ​ | 8,003 | ​ | ​ | 31,415 | ​ | ​ | 165,116 | ​ | ​ | 31,524 | ​ | ​ | 173,119
US Government agency | ​ |  | 817 | ​ |  | 35,174 | ​ |  | 10,497 | ​ |  | 60,789 | ​ |  | 11,314 | ​ |  | 95,963
Private label | ​ |  | 1 | ​ |  | 948 | ​ |  | 1,093 | ​ |  | 19,839 | ​ |  | 1,094 | ​ |  | 20,787
Obligations of states and political subdivisions thereof | ​ |  | 115 | ​ |  | 4,962 | ​ |  | 16,418 | ​ |  | 99,109 | ​ |  | 16,533 | ​ |  | 104,071
Corporate bonds | ​ |  | 26 | ​ |  | 2,438 | ​ |  | 4,495 | ​ |  | 75,002 | ​ |  | 4,521 | ​ |  | 77,440
Total securities available for sale | ​ | $ | 1,070 | ​ | $ | 52,232 | ​ | $ | 63,942 | ​ | $ | 420,466 | ​ | $ | 65,012 | ​ | $ | 472,698
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than Twelve Months | ​ | Over Twelve Months | ​ | Total
​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(in thousands) | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value
December 31, 2023 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of US Government-sponsored enterprises | ​ | $ | 1 | ​ | $ | 1,084 | ​ | $ | 28 | ​ | $ | 907 | ​ | $ | 29 | ​ | $ | 1,991
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | ​ | 10 | ​ | ​ | 3,439 | ​ | ​ | 30,322 | ​ | ​ | 188,611 | ​ | ​ | 30,332 | ​ | ​ | 192,050
US Government agency | ​ |  | 2 | ​ |  | 120 | ​ |  | 10,935 | ​ |  | 68,891 | ​ |  | 10,937 | ​ |  | 69,011
Private label | ​ |  | — | ​ |  | 26 | ​ |  | 1,855 | ​ |  | 59,007 | ​ |  | 1,855 | ​ |  | 59,033
Obligations of states and political subdivisions thereof | ​ |  | 26 | ​ |  | 3,099 | ​ |  | 14,178 | ​ |  | 101,036 | ​ |  | 14,204 | ​ |  | 104,135
Corporate bonds | ​ |  | 156 | ​ |  | 4,913 | ​ |  | 9,547 | ​ |  | 84,950 | ​ |  | 9,703 | ​ |  | 89,863
Total securities available for sale | ​ | $ | 195 | ​ | $ | 12,681 | ​ | $ | 66,865 | ​ | $ | 503,402 | ​ | $ | 67,060 | ​ | $ | 516,083
Schedule of allowance for credit losses on available for sale debt securities held | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | ​ | Obligations of US Government-sponsored enterprises | ​ | ​ | US Government -sponsored enterprises | ​ | ​ | US Government agency | ​ | ​ | Private Label | ​ | ​ | Obligations of states and political subdivisions thereof | ​ | ​ | Corporate Bonds | ​ | ​ | Total
Balance at January 1, 2024 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Credit losses on securities for which credit losses were not previously recorded | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,171 | ​ | ​ | 1,171
Credit losses on previously impaired securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Write-offs charged against the allowance | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (603) | ​ | ​ | (603)
Recoveries of amounts previously written off | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at December 31, 2024 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 568 | ​ | $ | 568
Summary of Securities Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | December 31, 2023
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
(in thousands) | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Securities pledged for deposits | ​ | $ | 18,483 | ​ | $ | 15,821 | ​ | $ | 24,347 | ​ | $ | 21,341
Securities pledged for repurchase agreements | ​ |  | 16,764 | ​ |  | 14,020 | ​ |  | 18,841 | ​ |  | 16,230
Securities pledged for borrowings (1) | ​ |  | 35,819 | ​ |  | 30,634 | ​ |  | 113,775 | ​ |  | 95,318
Total securities pledged | ​ | $ | 71,066 | ​ | $ | 60,475 | ​ | $ | 156,963 | ​ | $ | 132,889
(1) | The Bank pledged securities as collateral for certain borrowing arrangements with the Federal Home Loan Bank of Boston and Federal Reserve Bank of Boston.
Summary of securities available for sale that represent greater than 10% of shareholders' equity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | Amortized Cost | ​ | Fair Value
Federal National Mortgage Association | ​ | $ | 138,375 | ​ | $ | 118,106
Federal Home Loan Mortgage Corporation | ​ | ​ | 70,443 | ​ | ​ | 59,210
Government National Mortgage Association | ​ | ​ | 115,177 | ​ | ​ | 103,916
Obligations of states and political subdivisions thereof | ​ | ​ | 116,421 | ​ | ​ | 105,452
Corporate Bonds | ​ | ​ | 100,923 | ​ | ​ | 93,452
​

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