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SECURITIES AVAILABLE FOR SALE (Tables) | 9 Months Ended
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Sep. 30, 2025
SECURITIES AVAILABLE FOR SALE |
Summary of Available-for-Sale Debt Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value | ​ | Allowance
September 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Obligations of US Government-sponsored enterprises | ​ | $ | 1,139 | ​ | $ | — | ​ | $ | (15) | ​ | $ | 1,124 | ​ | $ | —
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
US Government-sponsored enterprises | ​ | ​ | 276,037 | ​ | ​ | 2,680 | ​ | ​ | (23,778) | ​ | ​ | 254,939 | ​ | ​ | —
US Government agency | ​ |  | 151,116 | ​ |  | 309 | ​ |  | (10,134) | ​ |  | 141,291 | ​ | ​ | —
Private label | ​ |  | 11,986 | ​ |  | 9 | ​ |  | (869) | ​ |  | 11,126 | ​ | ​ | —
Obligations of states and political subdivisions thereof | ​ |  | 120,775 | ​ |  | 3 | ​ |  | (18,155) | ​ |  | 102,623 | ​ | ​ | —
Corporate bonds | ​ |  | 89,738 | ​ |  | 222 | ​ |  | (3,253) | ​ |  | 86,707 | ​ | ​ | —
Total available-for-sale debt securities | ​ | $ | 650,791 | ​ | $ | 3,223 | ​ | $ | (56,204) | ​ | $ | 597,810 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 available-for-sale debt securities | ​ | $ | 583,316 | ​ | $ | 5,954 | ​ | $ | (68,252) | ​ | $ | 521,018 | ​ | $ | (568)
Schedule of Allowance for Credit Losses on Available-for-Sale Debt Securities Held | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
​ | ​ | ​ | 2025 | ​ | ​ | 2025
(in thousands) | ​ | ​ | Corporate Bonds | ​ | ​ | Total | ​ | ​ | Corporate Bonds | ​ | ​ | Total
Beginning Balance | ​ | $ | — | ​ | $ | — | ​ | $ | 568 | ​ | $ | 568
Provision for credit losses on available-for-sale debt securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 636 | ​ | ​ | 636
Charge-offs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,204) | ​ | ​ | (1,204)
Ending Balance | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale Securities, Segregated by Contractual Maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for sale
(in thousands) |  | Amortized Cost |  | Fair Value
Within 1 year |  | $ | 9,986 | ​ | $ | 9,832
Over 1 year to 5 years | ​ |  | 46,362 | ​ |  | 45,270
Over 5 years to 10 years | ​ |  | 41,691 | ​ |  | 39,470
Over 10 years | ​ |  | 113,613 | ​ |  | 95,882
Total bonds and obligations | ​ |  | 211,652 | ​ |  | 190,454
Mortgage-backed securities and collateralized mortgage obligations | ​ |  | 439,139 | ​ |  | 407,356
Total available-for-sale debt securities | ​ | $ | 650,791 | ​ | $ | 597,810
Schedule of Proceeds from Sales, Calls and Maturities of Available-for-Sale Debt Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Proceeds from sales | ​ | $ | 40,987 | ​ | $ | — | ​ | $ | 40,987 | ​ | $ | —
Proceeds from calls/paydowns | ​ |  | 31,559 | ​ |  | 10,350 | ​ | ​ | 73,216 | ​ | ​ | 44,006
Proceeds from maturities | ​ | ​ | — | ​ | ​ | 11 | ​ | ​ | — | ​ | ​ | 3,011
Gross realized gains | ​ | ​ | 247 | ​ | ​ | — | ​ | ​ | 247 | ​ | ​ | 50
Gross realized losses | ​ | ​ | 6 | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | —
Gross impairment losses | ​ | ​ | 178 | ​ | ​ | — | ​ | ​ | 4,571 | ​ | ​ | —
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
September 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of US Government-sponsored enterprises | ​ | $ | 1 | ​ | $ | 692 | ​ | $ | 14 | ​ | $ | 432 | ​ | $ | 15 | ​ | $ | 1,124
Mortgage-backed securities and collateralized mortgage obligations: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | ​ | 13 | ​ | ​ | 1,242 | ​ | ​ | 23,765 | ​ | ​ | 157,795 | ​ | ​ | 23,778 | ​ | ​ | 159,037
US Government agency | ​ |  | 1,017 | ​ |  | 35,579 | ​ |  | 9,117 | ​ |  | 70,735 | ​ |  | 10,134 | ​ |  | 106,314
Private label | ​ |  | — | ​ |  | — | ​ |  | 869 | ​ |  | 9,102 | ​ |  | 869 | ​ |  | 9,102
Obligations of states and political subdivisions thereof | ​ |  | 11 | ​ |  | 1,290 | ​ |  | 18,144 | ​ |  | 96,646 | ​ |  | 18,155 | ​ |  | 97,936
Corporate bonds | ​ |  | 134 | ​ |  | 13,858 | ​ |  | 3,119 | ​ |  | 58,381 | ​ |  | 3,253 | ​ |  | 72,239
Total available-for-sale debt securities | ​ | $ | 1,176 | ​ | $ | 52,661 | ​ | $ | 55,028 | ​ | $ | 393,091 | ​ | $ | 56,204 | ​ | $ | 445,752
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 available-for-sale debt securities | ​ | $ | 1,070 | ​ | $ | 52,232 | ​ | $ | 63,942 | ​ | $ | 420,466 | ​ | $ | 65,012 | ​ | $ | 472,698
Summary of Securities Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | December 31, 2024
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
(in thousands) | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Securities pledged for deposits | ​ | $ | 16,650 | ​ | $ | 14,757 | ​ | $ | 18,483 | ​ | $ | 15,821
Securities pledged for repurchase agreements | ​ |  | 15,505 | ​ |  | 13,463 | ​ |  | 16,764 | ​ |  | 14,020
Securities pledged for borrowings (1) | ​ |  | 49,886 | ​ |  | 43,452 | ​ |  | 35,819 | ​ |  | 30,634
Total securities pledged | ​ | $ | 82,041 | ​ | $ | 71,672 | ​ | $ | 71,066 | ​ | $ | 60,475
​
| (1) | The Bank pledged securities as collateral for certain borrowing arrangements with the Federal Home Loan Bank of Boston and the Federal Reserve Bank of Boston (the “Reserve Bank”).

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