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INVESTMENT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2025
INVESTMENT SECURITIES |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2025
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 341,913 |  | $ | 188 |  | $ | 33,599 |  | $ | 308,502
Agency collateralized mortgage obligations | ​ | ​ | 123,280 | ​ | ​ | 538 | ​ | ​ | 7,707 | ​ | ​ | 116,111
States and political subdivisions | ​ | ​ | 56,978 | ​ | ​ | 61 | ​ | ​ | 4,291 | ​ | ​ | 52,748
Small Business Administration securities | ​ | ​ | 64,811 | ​ | ​ | — | ​ | ​ | 6,258 | ​ | ​ | 58,553
​ |  | $ | 586,982 |  | $ | 787 |  | $ | 51,855 |  | $ | 535,914
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025
​ | ​ | ​ | ​ | ​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​
​ | ​ | Amortized | ​ | Fair Value | ​ | Carrying | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Adjustment |  | Value |  | Gains |  | Losses |  | Value
​ | ​ | (In Thousands)
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 70,742 | ​ | $ | 1,726 | ​ | $ | 72,468 | ​ | $ | — | ​ | $ | 7,149 | ​ | $ | 65,319
Agency collateralized mortgage obligations | ​ |  | 109,307 | ​ |  | (2,064) | ​ |  | 107,243 | ​ |  | — | ​ |  | 12,778 | ​ |  | 94,465
States and political subdivisions | ​ |  | 6,124 | ​ |  | 18 | ​ |  | 6,142 | ​ |  | — | ​ |  | 712 | ​ |  | 5,430
​ | ​ | $ | 186,173 | ​ | $ | (320) | ​ | $ | 185,853 | ​ | $ | — | ​ | $ | 20,639 | ​ | $ | 165,214
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 346,712 |  | $ | 69 |  | $ | 40,874 |  | $ | 305,907
Agency collateralized mortgage obligations | ​ | ​ | 123,395 | ​ | ​ | — | ​ | ​ | 9,771 | ​ | ​ | 113,624
States and political subdivisions securities | ​ | ​ | 58,608 | ​ | ​ | 69 | ​ | ​ | 2,729 | ​ | ​ | 55,948
Small Business Administration securities | ​ | ​ | 65,849 | ​ | ​ | — | ​ | ​ | 7,955 | ​ | ​ | 57,894
​ |  | $ | 594,564 |  | $ | 138 |  | $ | 61,329 |  | $ | 533,373
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair Value | ​ | Carrying | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Adjustment |  | Value |  | Gains |  | Losses |  | Value
​ | ​ | (In Thousands)
HELD-TO-MATURITY SECURITIES: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency mortgage-backed securities | ​ | $ | 71,065 | ​ | $ | 1,864 | ​ | $ | 72,929 | ​ | $ | — | ​ | $ | 8,523 | ​ | $ | 64,406
Agency collateralized mortgage obligations | ​ |  | 110,493 | ​ |  | (2,140) | ​ |  | 108,353 | ​ |  | — | ​ |  | 15,495 | ​ |  | 92,858
States and political subdivisions | ​ |  | 6,137 | ​ |  | 14 | ​ |  | 6,151 | ​ |  | — | ​ |  | 650 | ​ |  | 5,501
​ | ​ | $ | 187,695 | ​ | $ | (262) | ​ | $ | 187,433 | ​ | $ | — | ​ | $ | 24,668 | ​ | $ | 162,765
Schedule of amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available-for-Sale | ​ | Held-to-Maturity
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Carrying Value |  | Value
​ | ​ | (In Thousands)
One year or less | ​ | $ | — | ​ | $ | — | ​ | $ | — |  | $ | —
After one through two years | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After two through three years | ​ | ​ | 994 | ​ | ​ | 998 | ​ | ​ | — | ​ | ​ | —
After three through four years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 13,857 | ​ | ​ | 13,198 | ​ | ​ | 5,633 | ​ | ​ | 5,015
After fifteen years | ​ | ​ | 41,882 | ​ | ​ | 38,307 | ​ | ​ | 509 | ​ | ​ | 415
Securities not due on a single maturity date | ​ | ​ | 530,004 | ​ | ​ | 483,166 | ​ | ​ | 179,711 | ​ | ​ | 159,784
​ | ​ | $ | 586,982 | ​ | $ | 535,914 | ​ | $ | 185,853 |  | $ | 165,214
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
Description of Securities |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 22,043 | ​ | $ | (224) | ​ | $ | 255,387 | ​ | $ | (33,375) | ​ | $ | 277,430 | ​ | $ | (33,599)
Agency collateralized mortgage obligations | ​ | ​ | 9,023 | ​ | ​ | (237) | ​ | ​ | 63,892 | ​ | ​ | (7,470) | ​ | ​ | 72,915 | ​ | ​ | (7,707)
States and political subdivisions securities | ​ | ​ | 13,928 | ​ | ​ | (927) | ​ | ​ | 35,337 | ​ | ​ | (3,364) | ​ | ​ | 49,265 | ​ | ​ | (4,291)
Small Business Administration securities | ​ | ​ | 7,471 | ​ | ​ | (27) | ​ | ​ | 51,081 | ​ | ​ | (6,231) | ​ | ​ | 58,552 | ​ | ​ | (6,258)
​ |  | $ | 52,465 | ​ | $ | (1,415) | ​ | $ | 405,697 | ​ | $ | (50,440) | ​ | $ | 458,162 | ​ | $ | (51,855)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 65,319 | ​ | $ | (7,149) | ​ | $ | 65,319 | ​ | $ | (7,149)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 94,465 | ​ | ​ | (12,778) | ​ | ​ | 94,465 | ​ | ​ | (12,778)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,430 | ​ | ​ | (712) | ​ | ​ | 5,430 | ​ | ​ | (712)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 165,214 | ​ | $ | (20,639) | ​ | $ | 165,214 | ​ | $ | (20,639)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
Description of Securities |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 45,977 |  | $ | (1,008) |  | $ | 253,971 |  | $ | (39,866) |  | $ | 299,948 |  | $ | (40,874)
Agency collateralized mortgage obligations | ​ | ​ | 50,720 | ​ | ​ | (890) | ​ | ​ | 62,903 | ​ | ​ | (8,881) | ​ | ​ | 113,623 | ​ | ​ | (9,771)
States and political subdivisions securities | ​ | ​ | 7,229 | ​ | ​ | (270) | ​ | ​ | 50,665 | ​ | ​ | (7,685) | ​ | ​ | 57,894 | ​ | ​ | (7,955)
Small Business Administration securities | ​ | ​ | 14,523 | ​ | ​ | (343) | ​ | ​ | 37,945 | ​ | ​ | (2,386) | ​ | ​ | 52,468 | ​ | ​ | (2,729)
​ |  | $ | 118,449 | ​ | $ | (2,511) |  | $ | 405,484 | ​ | $ | (58,818) |  | $ | 523,933 | ​ | $ | (61,329)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 64,406 | ​ | $ | (8,523) | ​ | $ | 64,406 | ​ | $ | (8,523)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 92,858 | ​ | ​ | (15,495) | ​ | ​ | 92,858 | ​ | ​ | (15,495)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,501 | ​ | ​ | (650) | ​ | ​ | 5,501 | ​ | ​ | (650)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 162,765 | ​ | $ | (24,668) | ​ | $ | 162,765 | ​ | $ | (24,668)
​

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