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Investments in Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments in Securities |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 316,114 | ​ | $ | 7 | ​ | $ | 35,890 | ​ | $ | 280,231
Agency collateralized mortgage obligations | ​ |  | 85,989 | ​ | ​ | — | ​ | ​ | 10,043 | ​ | ​ | 75,946
States and political subdivisions securities | ​ |  | 59,141 | ​ | ​ | 527 | ​ | ​ | 1,531 | ​ | ​ | 58,137
Small Business Administration securities | ​ |  | 70,648 | ​ | ​ | — | ​ | ​ | 6,755 | ​ | ​ | 63,893
​ |  | $ | 531,892 | ​ | $ | 534 | ​ | $ | 54,219 | ​ | $ | 478,207
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 |  | $ | 72,495 |  | $ | 2,436 |  | $ | 74,931 |  | $ | — |  | $ | 8,686 |  | $ | 66,245
Agency collateralized mortgage obligations | ​ | ​ | 116,405 | ​ | ​ | (2,502) | ​ | ​ | 113,903 | ​ | ​ | — | ​ | ​ | 14,662 | ​ | ​ | 99,241
States and political subdivisions | ​ | ​ | 6,188 | ​ | ​ | 1 | ​ | ​ | 6,189 | ​ | ​ | — | ​ | ​ | 482 | ​ | ​ | 5,707
​ |  | $ | 195,088 |  | $ | (65) |  | $ | 195,023 |  | $ | — |  | $ | 23,830 |  | $ | 171,193
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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After two through three years | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After three through four years | ​ | ​ | 985 | ​ | ​ | 987 | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ |  | 10,615 | ​ | ​ | 10,313 | ​ | ​ | 3,245 | ​ | ​ | 2,913
After fifteen years | ​ |  | 46,763 | ​ | ​ | 44,403 | ​ | ​ | 2,906 | ​ | ​ | 2,588
Securities not due on a single maturity date | ​ |  | 535,956 | ​ | ​ | 477,425 | ​ | ​ | 181,282 | ​ | ​ | 157,264
​ | ​ | $ | 594,564 | ​ | $ | 533,373 | ​ | $ | 187,433 | ​ | $ | 162,765
Schedule of amortized cost and fair values of securities pledged as collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public deposits | ​ | $ | 13,880 | ​ | $ | 11,801 | ​ | $ | 17,412 | ​ | $ | 15,225
Collateralized borrowing accounts | ​ |  | 86,561 | ​ | ​ | 76,871 | ​ |  | 123,220 | ​ | ​ | 109,660
FHLBank borrowing account | ​ | ​ | 91,900 | ​ | ​ | 90,544 | ​ | ​ | — | ​ | ​ | —
Federal Reserve Bank’s Bank Term Funding Program | ​ | ​ | 186,836 | ​ | ​ | 161,620 | ​ | ​ | — | ​ | ​ | —
Other | ​ |  | 3,572 | ​ | ​ | 3,270 | ​ |  | 3,815 | ​ | ​ | 3,507
​ | ​ | $ | 382,749 | ​ | $ | 344,106 | ​ | $ | 144,447 | ​ | $ | 128,392
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
Small Business Administration securities | ​ |  | 7,229 | ​ | ​ | (270) | ​ | ​ | 50,665 | ​ | ​ | (7,685) | ​ | ​ | 57,894 | ​ | ​ | (7,955)
States and political subdivisions 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)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023
​ | ​ | 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 | ​ | $ | 4,318 | ​ | $ | (9) | ​ | $ | 274,801 | ​ | $ | (35,881) | ​ | $ | 279,119 | ​ | $ | (35,890)
Agency collateralized mortgage obligations | ​ |  | 9,080 | ​ | ​ | (216) | ​ | ​ | 66,866 | ​ | ​ | (9,827) | ​ | ​ | 75,946 | ​ | ​ | (10,043)
Small Business Administration securities | ​ |  | 7,782 | ​ | ​ | (133) | ​ | ​ | 56,111 | ​ | ​ | (6,622) | ​ | ​ | 63,893 | ​ | ​ | (6,755)
States and political subdivisions securities | ​ |  | — | ​ | ​ | — | ​ | ​ | 37,969 | ​ | ​ | (1,531) | ​ | ​ | 37,969 | ​ | ​ | (1,531)
​ | ​ | $ | 21,180 | ​ | $ | (358) | ​ | $ | 435,747 | ​ | $ | (53,861) | ​ | $ | 456,927 | ​ | $ | (54,219)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 66,245 | ​ | $ | (8,686) | ​ | $ | 66,245 | ​ | $ | (8,686)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 99,241 | ​ | ​ | (14,662) | ​ | ​ | 99,241 | ​ | ​ | (14,662)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,707 | ​ | ​ | (482) | ​ | ​ | 5,707 | ​ | ​ | (482)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 171,193 | ​ | $ | (23,830) | ​ | $ | 171,193 | ​ | $ | (23,830)

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