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SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2025
SECURITIES |
Schedule of major categories of securities owned by entity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | Allowance | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | For Credit | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses | ​ | ​ | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​ |  | ​ |
Agency notes | ​ | $ | 10,000 | ​ | $ | — | ​ | $ | (236) | ​ | $ | — | ​ | $ | 9,764
Corporate securities | ​ |  | 180,198 | ​ | ​ | 424 | ​ | ​ | (7,730) | ​ | ​ | (1,800) | ​ |  | 171,092
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 285,789 | ​ | ​ | 2,756 | ​ | ​ | (880) | ​ | ​ | — | ​ |  | 287,665
Agency CMOs | ​ |  | 236,411 | ​ | ​ | 695 | ​ | ​ | (24,440) | ​ | ​ | — | ​ |  | 212,666
State and municipal obligations | ​ | ​ | 23,387 | ​ | ​ | — | ​ | ​ | (1,113) | ​ | ​ | — | ​ | ​ | 22,274
Total securities available-for-sale | ​ | $ | 735,785 | ​ | $ | 3,875 | ​ | $ | (34,399) | ​ | $ | (1,800) | ​ | $ | 703,461
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 90,188 | ​ | $ | — | ​ | $ | (7,786) | ​ | $ | 82,402
Corporate securities | ​ | ​ | 13,000 | ​ | ​ | 200 | ​ | ​ | (560) | ​ | ​ | 12,640
Pass-through MBS issued by GSEs | ​ | ​ | 290,933 | ​ | ​ | 200 | ​ | ​ | (36,559) | ​ | ​ | 254,574
Agency CMOs | ​ |  | 231,067 | ​ |  | 320 | ​ |  | (24,496) | ​ |  | 206,891
Total securities held-to-maturity | ​ | $ | 625,188 | ​ | $ | 720 | ​ | $ | (69,401) | ​ | $ | 556,507
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 10,000 | ​ | $ | — | ​ | $ | (393) | ​ | $ | 9,607
Corporate securities | ​ | ​ | 173,972 | ​ |  | 755 | ​ |  | (10,778) | ​ |  | 163,949
Pass-through MBS issued by GSEs | ​ |  | 303,303 | ​ |  | 30 | ​ |  | (3,112) | ​ |  | 300,221
Agency CMOs | ​ |  | 220,314 | ​ |  | 16 | ​ |  | (28,442) | ​ |  | 191,888
State and municipal obligations | ​ |  | 26,545 | ​ | ​ | — | ​ | ​ | (1,517) | ​ | ​ | 25,028
Total securities available-for-sale | ​ | $ | 734,134 | ​ | $ | 801 | ​ | $ | (44,242) | ​ | $ | 690,693
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 89,977 | ​ | $ | — | ​ | $ | (10,961) | ​ | $ | 79,016
Corporate securities | ​ | ​ | 13,000 | ​ | ​ | 140 | ​ | ​ | (855) | ​ | ​ | 12,285
Pass-through MBS issued by GSEs | ​ | ​ | 298,697 | ​ | ​ | — | ​ | ​ | (43,716) | ​ | ​ | 254,981
Agency CMOs | ​ |  | 235,665 | ​ |  | 29 | ​ |  | (29,699) | ​ |  | 205,995
Total securities held-to-maturity | ​ | $ | 637,339 | ​ | $ | 169 | ​ | $ | (85,231) | ​ | $ | 552,277
Schedule of amortized cost and fair value of debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | Amortized | ​ | Fair
(In thousands) | ​ | Cost | ​ | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 8,604 | ​ | $ | 8,529
One to five years | ​ | ​ | 73,503 | ​ | ​ | 69,378
Five to ten years | ​ | ​ | 131,478 | ​ | ​ | 125,223
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 522,200 | ​ | ​ | 500,331
Total | ​ | $ | 735,785 | ​ | $ | 703,461
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | — | ​ | $ | —
One to five years | ​ | ​ | 34,507 | ​ | ​ | 32,405
Five to ten years | ​ | ​ | 68,681 | ​ | ​ | 62,637
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMOs | ​ | ​ | 522,000 | ​ | ​ | 461,465
Total | ​ | $ | 625,188 | ​ | $ | 556,507
Summary of sale of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
(In thousands) |  | 2025 |  | 2024 | ​ | 2025 |  | 2024 | ​
Securities available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds | ​ | $ | 24,837 | ​ | $ | — | ​ | $ | 24,837 | ​ | $ | — | ​
Gross gains | ​ | ​ | 748 | ​ | ​ | — | ​ | ​ | 748 | ​ | ​ | — | ​
Tax expense on gains | ​ | ​ | 221 | ​ | ​ | — | ​ | ​ | 221 | ​ | ​ | — | ​
Gross losses | ​ | ​ | 676 | ​ | ​ | — | ​ | ​ | 676 | ​ | ​ | — | ​
Tax benefit on losses | ​ | ​ | 200 | ​ | ​ | — | ​ | ​ | 200 | ​ | ​ | — | ​
Schedule of gross unrealized losses and fair value of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 9,764 | ​ | $ | 236 | ​ | $ | 9,764 | ​ | $ | 236
Corporate securities | ​ | ​ | 27,733 | ​ | ​ | 212 | ​ | ​ | 89,744 | ​ | ​ | 7,518 | ​ | ​ | 117,477 | ​ | ​ | 7,730
Pass-through MBS issued by GSEs | ​ | ​ | 33,584 | ​ | ​ | 108 | ​ | ​ | 5,784 | ​ | ​ | 772 | ​ | ​ | 39,368 | ​ | ​ | 880
Agency CMOs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 147,252 | ​ | ​ | 24,440 | ​ | ​ | 147,252 | ​ | ​ | 24,440
State and municipal obligations | ​ |  | — | ​ |  | — | ​ |  | 18,774 | ​ |  | 1,113 | ​ | ​ | 18,774 | ​ | ​ | 1,113
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 9,607 | ​ | $ | 393 | ​ | $ | 9,607 | ​ | $ | 393
Corporate securities | ​ | ​ | 2,925 | ​ | ​ | 16 | ​ | ​ | 141,124 | ​ | ​ | 10,762 | ​ | ​ | 144,049 | ​ | ​ | 10,778
Pass-through MBS issued by GSEs | ​ | ​ | 289,095 | ​ | ​ | 2,170 | ​ | ​ | 6,119 | ​ | ​ | 942 | ​ | ​ | 295,214 | ​ | ​ | 3,112
Agency CMOs | ​ | ​ | 32,101 | ​ | ​ | 357 | ​ | ​ | 154,770 | ​ | ​ | 28,085 | ​ | ​ | 186,871 | ​ | ​ | 28,442
State and municipal obligations | ​ | ​ | 3,469 | ​ |  | 31 | ​ |  | 21,559 | ​ |  | 1,486 | ​ | ​ | 25,028 | ​ | ​ | 1,517
​
Roll forward of the allowance for credit losses for corporate securities available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
(In thousands) |  | 2025 | ​ | 2024 |  | 2025 | ​ | 2024
Beginning balance | ​ | $ | 893 | ​ | $ | — | ​ | $ | — | ​ | $ | —
Provision for credit losses | ​ |  | 907 | ​ |  | — | ​ |  | 1,800 | ​ |  | —
Ending balance | ​ | $ | 1,800 | ​ | $ | — | ​ | $ | 1,800 | ​ | $ | —

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