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SECURITIES AVAILABLE FOR SALE (Tables) | 12 Months Ended
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Dec. 31, 2023
SECURITIES AVAILABLE FOR SALE |
Summary of Securities Available for Sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2022 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Debt securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Obligations of US Government-sponsored enterprises | ​ | $ | 2,692 | ​ | $ | 5 | ​ | $ | (37) | ​ | $ | 2,660
Mortgage-backed securities and collateralized mortgage obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
US Government-sponsored enterprises | ​ | ​ | 249,838 | ​ | ​ | 14 | ​ | ​ | (34,825) | ​ | ​ | 215,027
US Government agency | ​ |  | 90,318 | ​ |  | 16 | ​ |  | (10,728) | ​ |  | 79,606
Private label | ​ |  | 64,056 | ​ |  | 34 | ​ |  | (3,936) | ​ |  | 60,154
Obligations of states and political subdivisions thereof | ​ |  | 121,939 | ​ |  | 7,149 | ​ |  | (21,351) | ​ |  | 107,737
Corporate bonds | ​ |  | 102,505 | ​ |  | 33 | ​ |  | (8,206) | ​ |  | 94,332
Total securities available for sale | ​ | $ | 631,348 | ​ | $ | 7,251 | ​ | $ | (79,083) | ​ | $ | 559,516
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 |  | $ | 3,038 | ​ | $ | 3,017
Over 1 year to 5 years | ​ |  | 50,471 | ​ |  | 47,138
Over 5 years to 10 years | ​ |  | 45,706 | ​ |  | 44,887
Over 10 years | ​ |  | 128,215 | ​ |  | 112,986
Total bonds and obligations | ​ |  | 227,430 | ​ |  | 208,028
Mortgage-backed securities and collateralized mortgage obligations | ​ |  | 369,495 | ​ |  | 326,546
Total securities available for sale | ​ | $ | 596,925 | ​ | $ | 534,574
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
2023 | ​ | $ | 2,000 | ​ | $ | 34 | ​ | $ | — | ​ | $ | 34
2022 | ​ | ​ | 7,130 | ​ | ​ | 151 | ​ | ​ | (98) | ​ | ​ | 53
2021 | ​ |  | 92,723 | ​ | ​ | 2,933 | ​ | ​ | (63) | ​ | ​ | 2,870
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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2022 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of US Government-sponsored enterprises | ​ | $ | 32 | ​ | $ | 435 | ​ | $ | 6 | ​ | $ | 790 | ​ | $ | 38 | ​ | $ | 1,225
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | ​ | 7,005 | ​ | ​ | 82,483 | ​ | ​ | 27,820 | ​ | ​ | 127,745 | ​ | ​ | 34,825 | ​ | ​ | 210,228
US Government agency | ​ |  | 2,870 | ​ |  | 42,430 | ​ |  | 7,857 | ​ |  | 34,198 | ​ |  | 10,727 | ​ |  | 76,628
Private label | ​ |  | 841 | ​ |  | 15,694 | ​ |  | 3,095 | ​ |  | 44,396 | ​ |  | 3,936 | ​ |  | 60,090
Obligations of states and political subdivisions thereof | ​ |  | 7,990 | ​ |  | 48,799 | ​ |  | 13,361 | ​ |  | 55,702 | ​ |  | 21,351 | ​ |  | 104,501
Corporate bonds | ​ |  | 4,733 | ​ |  | 65,279 | ​ |  | 3,473 | ​ |  | 25,027 | ​ |  | 8,206 | ​ |  | 90,306
Total securities available for sale | ​ | $ | 23,471 | ​ | $ | 255,120 | ​ | $ | 55,612 | ​ | $ | 287,858 | ​ | $ | 79,083 | ​ | $ | 542,978
Summary of Securities Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 | ​ | December 31, 2022
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
(in thousands) | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Securities pledged for deposits | ​ | $ | 24,347 | ​ | $ | 21,341 | ​ | $ | 26,807 | ​ | $ | 23,430
Securities pledged for repurchase agreements | ​ |  | 18,841 | ​ |  | 16,230 | ​ |  | 21,001 | ​ |  | 17,964
Securities pledged for borrowings (1) | ​ |  | 113,775 | ​ |  | 95,318 | ​ |  | 40,686 | ​ |  | 33,962
Total securities pledged | ​ | $ | 156,963 | ​ | $ | 132,889 | ​ | $ | 88,494 | ​ | $ | 75,356
(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.

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