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SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2024
SECURITIES |
Schedule of major categories of securities owned by entity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 10,000 | ​ | $ | — | ​ | $ | (568) | ​ | $ | 9,432
Treasury securities | ​ | ​ | 206,420 | ​ | ​ | — | ​ | ​ | (8,508) | ​ | ​ | 197,912
Corporate securities | ​ |  | 173,932 | ​ |  | 348 | ​ |  | (18,870) | ​ |  | 155,410
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 212,655 | ​ |  | 16 | ​ |  | (25,627) | ​ |  | 187,044
Agency CMOs | ​ |  | 290,992 | ​ |  | 18 | ​ |  | (47,164) | ​ |  | 243,846
State and municipal obligations | ​ | ​ | 27,573 | ​ | ​ | — | ​ | ​ | (1,995) | ​ | ​ | 25,578
Total securities available-for-sale | ​ | $ | 921,572 | ​ | $ | 382 | ​ | $ | (102,732) | ​ | $ | 819,222
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 89,769 | ​ | $ | — | ​ | $ | (11,721) | ​ | $ | 78,048
Corporate securities | ​ | ​ | 13,000 | ​ | ​ | 40 | ​ | ​ | (1,360) | ​ | ​ | 11,680
Pass-through MBS issued by GSEs | ​ | ​ | 270,048 | ​ | ​ | — | ​ | ​ | (42,260) | ​ | ​ | 227,788
Agency CMOs | ​ |  | 215,183 | ​ |  | 35 | ​ |  | (29,897) | ​ |  | 185,321
Total securities held-to-maturity | ​ | $ | 588,000 | ​ | $ | 75 | ​ | $ | (85,238) | ​ | $ | 502,837
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024
​ | ​ | Amortized | ​ | Fair
(In thousands) | ​ | Cost | ​ | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 120,035 | ​ | $ | 116,850
One to five years | ​ | ​ | 136,862 | ​ | ​ | 127,506
Five to ten years | ​ | ​ | 161,028 | ​ | ​ | 143,976
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 503,647 | ​ | ​ | 430,890
Total | ​ | $ | 921,572 | ​ | $ | 819,222
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | — | ​ | $ | —
One to five years | ​ | ​ | 19,806 | ​ | ​ | 18,303
Five to ten years | ​ | ​ | 82,963 | ​ | ​ | 71,425
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 485,231 | ​ | ​ | 413,109
Total | ​ | $ | 588,000 | ​ | $ | 502,837
Summary of sale of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 9,432 | ​ | $ | 568 | ​ | $ | 9,432 | ​ | $ | 568
Treasury securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 197,912 | ​ | ​ | 8,508 | ​ | ​ | 197,912 | ​ | ​ | 8,508
Corporate securities | ​ | ​ | 6,328 | ​ | ​ | 516 | ​ | ​ | 129,653 | ​ | ​ | 18,354 | ​ | ​ | 135,981 | ​ | ​ | 18,870
Pass-through MBS issued by GSEs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 185,243 | ​ | ​ | 25,627 | ​ | ​ | 185,243 | ​ | ​ | 25,627
Agency CMOs | ​ | ​ | 2,449 | ​ | ​ | 21 | ​ | ​ | 236,379 | ​ | ​ | 47,143 | ​ | ​ | 238,828 | ​ | ​ | 47,164
State and municipal obligations | ​ |  | 3,430 | ​ |  | 70 | ​ |  | 22,148 | ​ |  | 1,925 | ​ | ​ | 25,578 | ​ | ​ | 1,995
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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