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Investments in Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments in Securities |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 327,266 | ​ | $ | — | ​ | $ | 40,784 | ​ | $ | 286,482
Agency collateralized mortgage obligations | ​ |  | 90,205 | ​ | ​ | — | ​ | ​ | 11,731 | ​ | ​ | 78,474
States and political subdivisions securities | ​ |  | 60,667 | ​ | ​ | 119 | ​ | ​ | 3,291 | ​ | ​ | 57,495
Small Business Administration securities | ​ |  | 75,076 | ​ | ​ | — | ​ | ​ | 6,935 | ​ | ​ | 68,141
​ |  | $ | 553,214 | ​ | $ | 119 | ​ | $ | 62,741 | ​ | $ | 490,592
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 |  | $ | 73,891 |  | $ | 3,015 |  | $ | 76,906 |  | $ | — |  | $ | 9,820 |  | $ | 67,086
Agency collateralized mortgage obligations | ​ | ​ | 122,247 | ​ | ​ | (2,885) | ​ | ​ | 119,362 | ​ | ​ | — | ​ | ​ | 14,129 | ​ | ​ | 105,233
States and political subdivisions | ​ | ​ | 6,239 | ​ | ​ | (12) | ​ | ​ | 6,227 | ​ | ​ | — | ​ | ​ | 781 | ​ | ​ | 5,446
​ |  | $ | 202,377 |  | $ | 118 |  | $ | 202,495 |  | $ | — |  | $ | 24,730 |  | $ | 177,765
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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After two through three years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After three through four years | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | 952 | ​ | ​ | 981 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ |  | 9,682 | ​ | ​ | 9,634 | ​ | ​ | 3,247 | ​ | ​ | 2,986
After fifteen years | ​ |  | 48,262 | ​ | ​ | 47,277 | ​ | ​ | 2,942 | ​ | ​ | 2,721
Securities not due on a single maturity date | ​ |  | 472,751 | ​ | ​ | 420,070 | ​ | ​ | 188,834 | ​ | ​ | 165,486
​ | ​ | $ | 531,892 | ​ | $ | 478,207 | ​ | $ | 195,023 | ​ | $ | 171,193
Schedule of amortized cost and fair values of securities pledged as collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public deposits | ​ | $ | 17,412 | ​ | $ | 15,225 | ​ | $ | 15,402 | ​ | $ | 13,489
Collateralized borrowing accounts | ​ |  | 123,220 | ​ | ​ | 109,660 | ​ |  | 210,330 | ​ |  | 186,170
Other | ​ |  | 3,815 | ​ | ​ | 3,507 | ​ |  | 4,018 | ​ |  | 3,764
​ | ​ | $ | 144,447 | ​ | $ | 128,392 | ​ | $ | 229,750 | ​ | $ | 203,423
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022
​ | ​ | 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 | ​ | $ | 221,562 | ​ | $ | (27,597) | ​ | $ | 64,918 | ​ | $ | (13,187) | ​ | $ | 286,480 | ​ | $ | (40,784)
Agency collateralized mortgage obligations | ​ |  | 28,537 | ​ | ​ | (3,262) | ​ | ​ | 40,642 | ​ | ​ | (8,469) | ​ | ​ | 69,179 | ​ | ​ | (11,731)
Small Business Administration securities | ​ |  | 60,473 | ​ | ​ | (5,224) | ​ | ​ | 7,667 | ​ | ​ | (1,711) | ​ | ​ | 68,140 | ​ | ​ | (6,935)
States and political subdivisions securities | ​ |  | 44,455 | ​ | ​ | (2,913) | ​ | ​ | 3,753 | ​ | ​ | (378) | ​ | ​ | 48,208 | ​ | ​ | (3,291)
​ | ​ | $ | 355,027 | ​ | $ | (38,996) | ​ | $ | 116,980 | ​ | $ | (23,745) | ​ | $ | 472,007 | ​ | $ | (62,741)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 59,218 | ​ | $ | (7,766) | ​ | $ | 7,868 | ​ | $ | (2,054) | ​ | $ | 67,086 | ​ | $ | (9,820)
Agency collateralized mortgage obligations | ​ | ​ | 61,055 | ​ | ​ | (6,411) | ​ | ​ | 44,178 | ​ | ​ | (7,718) | ​ | ​ | 105,233 | ​ | ​ | (14,129)
States and political subdivisions securities | ​ | ​ | 900 | ​ | ​ | (101) | ​ | ​ | 4,546 | ​ | ​ | (680) | ​ | ​ | 5,446 | ​ | ​ | (781)
​ | ​ | $ | 121,173 | ​ | $ | (14,278) | ​ | $ | 56,592 | ​ | $ | (10,452) | ​ | $ | 177,765 | ​ | $ | (24,730)

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