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Investments in Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments in Securities |
Schedule of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 219,624 | ​ | $ | 10,561 | ​ | $ | 744 | ​ | $ | 229,441
Agency collateralized mortgage obligations | ​ |  | 204,332 | ​ |  | 2,443 | ​ |  | 2,498 | ​ |  | 204,277
States and political subdivisions securities | ​ |  | 38,440 | ​ |  | 1,618 | ​ |  | 43 | ​ |  | 40,015
Small Business Administration securities | ​ |  | 26,802 | ​ |  | 497 | ​ |  | — | ​ |  | 27,299
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 489,198 | ​ | $ | 15,119 | ​ | $ | 3,285 | ​ | $ | 501,032
​
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ |  | 6,761 | ​ |  | 6,565 | ​ | ​ | 2,578 | ​ | ​ | 2,233
After fifteen years | ​ |  | 53,661 | ​ |  | 50,685 | ​ | ​ | 3,649 | ​ | ​ | 3,213
Securities not due on a single maturity date | ​ |  | 492,547 | ​ |  | 433,097 | ​ | ​ | 196,268 | ​ | ​ | 172,319
​ | ​ | $ | 553,214 | ​ | $ | 490,592 | ​ | $ | 202,495 | ​ | $ | 177,765
​
Schedule of amortized cost and fair values of securities pledged as collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public deposits | ​ | $ | 15,402 | ​ | $ | 13,489 | ​ | $ | 4,742 | ​ | $ | 5,029
Collateralized borrowing accounts | ​ |  | 210,330 | ​ |  | 186,170 | ​ |  | 133,242 | ​ |  | 139,112
Other | ​ |  | 4,018 | ​ |  | 3,764 | ​ |  | 6,257 | ​ |  | 6,461
​ | ​ | $ | 229,750 | ​ | $ | 203,423 | ​ | $ | 144,241 | ​ | $ | 150,602
​
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
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)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021
​ | ​ | 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 | ​ | $ | 47,769 | ​ | $ | (388) | ​ | $ | 10,583 | ​ | $ | (356) | ​ | $ | 58,352 | ​ | $ | (744)
Agency collateralized mortgage obligations | ​ |  | 92,727 | ​ |  | (1,588) | ​ |  | 16,298 | ​ |  | (910) | ​ |  | 109,025 | ​ |  | (2,498)
States and political subdivisions securities | ​ |  | 6,537 | ​ |  | (43) | ​ |  | — | ​ |  | — | ​ |  | 6,537 | ​ |  | (43)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 147,033 | ​ | $ | (2,019) | ​ | $ | 26,881 | ​ | $ | (1,266) | ​ | $ | 173,914 | ​ | $ | (3,285)
​

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