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SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2024
SECURITIES |
Schedule of major categories of securities owned by entity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 10,000 | ​ | ​ | — | ​ | ​ | (311) | ​ | $ | 9,689
Treasury securities | ​ | ​ | 166,278 | ​ | ​ | — | ​ | ​ | (4,907) | ​ | ​ | 161,371
Corporate securities | ​ |  | 173,909 | ​ | ​ | 607 | ​ | ​ | (13,887) | ​ |  | 160,629
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 197,805 | ​ | ​ | 26 | ​ | ​ | (18,495) | ​ |  | 179,336
Agency CMOs | ​ |  | 276,677 | ​ | ​ | 61 | ​ | ​ | (38,965) | ​ |  | 237,773
State and municipal obligations | ​ | ​ | 27,154 | ​ | ​ | 1 | ​ | ​ | (1,345) | ​ | ​ | 25,810
Total securities available-for-sale | ​ | $ | 851,823 | ​ | $ | 695 | ​ | $ | (77,910) | ​ | $ | 774,608
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 89,873 | ​ | $ | — | ​ | $ | (8,355) | ​ | $ | 81,518
Corporate securities | ​ | ​ | 13,000 | ​ | ​ | 80 | ​ | ​ | (975) | ​ | ​ | 12,105
Pass-through MBS issued by GSEs | ​ | ​ | 266,043 | ​ | ​ | 136 | ​ | ​ | (31,803) | ​ | ​ | 234,376
Agency CMOs | ​ |  | 223,498 | ​ |  | 151 | ​ |  | (23,118) | ​ |  | 200,531
Total securities held-to-maturity | ​ | $ | 592,414 | ​ | $ | 367 | ​ | $ | (64,251) | ​ | $ | 528,530
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 10,000 | ​ | $ | — | ​ | $ | (629) | ​ | $ | 9,371
Treasury securities | ​ | ​ | 245,877 | ​ | ​ | — | ​ | ​ | (11,687) | ​ | ​ | 234,190
Corporate securities | ​ | ​ | 174,978 | ​ |  | — | ​ |  | (23,808) | ​ |  | 151,170
Pass-through MBS issued by GSEs | ​ |  | 230,253 | ​ |  | 10 | ​ |  | (24,978) | ​ |  | 205,285
Agency CMOs | ​ |  | 305,860 | ​ |  | 46 | ​ |  | (46,491) | ​ |  | 259,415
State and municipal obligations | ​ |  | 28,741 | ​ | ​ | — | ​ | ​ | (1,932) | ​ | ​ | 26,809
Total securities available-for-sale | ​ | $ | 995,709 | ​ | $ | 56 | ​ | $ | (109,525) | ​ | $ | 886,240
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 89,563 | ​ | $ | — | ​ | $ | (11,300) | ​ | $ | 78,263
Corporate securities | ​ | ​ | 9,000 | ​ | ​ | — | ​ | ​ | (1,825) | ​ | ​ | 7,175
Pass-through MBS issued by GSEs | ​ | ​ | 279,853 | ​ | ​ | — | ​ | ​ | (37,579) | ​ | ​ | 242,274
Agency CMOs | ​ |  | 216,223 | ​ |  | 16 | ​ |  | (27,021) | ​ |  | 189,218
Total securities held-to-maturity | ​ | $ | 594,639 | ​ | $ | 16 | ​ | $ | (77,725) | ​ | $ | 516,930
Schedule of amortized cost and fair value of debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | Amortized | ​ | Fair
(In thousands) | ​ | Cost | ​ | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 119,761 | ​ | $ | 117,040
One to five years | ​ | ​ | 96,687 | ​ | ​ | 91,475
Five to ten years | ​ | ​ | 160,893 | ​ | ​ | 148,984
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 474,482 | ​ | ​ | 417,109
Total | ​ | $ | 851,823 | ​ | $ | 774,608
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | — | ​ | $ | —
One to five years | ​ | ​ | 19,818 | ​ | ​ | 18,865
Five to ten years | ​ | ​ | 83,055 | ​ | ​ | 74,758
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 489,541 | ​ | ​ | 434,907
Total | ​ | $ | 592,414 | ​ | $ | 528,530
Summary of sale of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023
Securities available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 77,804
Gross gains | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 130
Tax expense on gains | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 39
Gross losses | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,577
Tax benefit on losses | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 467
Schedule of gross unrealized losses and fair value of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | — | ​ | $ | — | ​ | $ | 9,689 | ​ | $ | 311 | ​ | $ | 9,689 | ​ | $ | 311
Treasury securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 161,371 | ​ | ​ | 4,907 | ​ | ​ | 161,371 | ​ | ​ | 4,907
Corporate securities | ​ | ​ | 3,700 | ​ | ​ | 300 | ​ | ​ | 134,359 | ​ | ​ | 13,587 | ​ | ​ | 138,059 | ​ | ​ | 13,887
Pass-through MBS issued by GSEs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 177,238 | ​ | ​ | 18,495 | ​ | ​ | 177,238 | ​ | ​ | 18,495
Agency CMOs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 230,244 | ​ | ​ | 38,965 | ​ | ​ | 230,244 | ​ | ​ | 38,965
State and municipal obligations | ​ |  | — | ​ |  | — | ​ |  | 22,309 | ​ |  | 1,345 | ​ | ​ | 22,309 | ​ | ​ | 1,345
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency Notes | ​ | $ | — | ​ | $ | — | ​ | $ | 9,371 | ​ | $ | 629 | ​ | $ | 9,371 | ​ | $ | 629
Treasury securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 234,190 | ​ | ​ | 11,687 | ​ | ​ | 234,190 | ​ | ​ | 11,687
Corporate securities | ​ | ​ | 20,935 | ​ | ​ | 917 | ​ | ​ | 130,235 | ​ | ​ | 22,891 | ​ | ​ | 151,170 | ​ | ​ | 23,808
Pass-through MBS issued by GSEs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 203,469 | ​ | ​ | 24,978 | ​ | ​ | 203,469 | ​ | ​ | 24,978
Agency CMOs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 251,900 | ​ | ​ | 46,491 | ​ | ​ | 251,900 | ​ | ​ | 46,491
State and municipal obligations | ​ | ​ | 1,796 | ​ |  | 54 | ​ |  | 21,513 | ​ |  | 1,878 | ​ | ​ | 23,309 | ​ | ​ | 1,932
​

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