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Investments in Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments in Securities |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 151,106 | ​ | $ | 19,665 | ​ | $ | 831 | ​ | $ | 169,940
Agency collateralized mortgage obligations | ​ |  | 168,472 | ​ |  | 8,524 | ​ |  | 375 | ​ |  | 176,621
States and political subdivisions securities | ​ |  | 45,196 | ​ |  | 2,135 | ​ |  | 6 | ​ |  | 47,325
Small Business Administration securities | ​ |  | 20,033 | ​ |  | 1,014 | ​ |  | — | ​ |  | 21,047
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 384,807 | ​ | $ | 31,338 | ​ | $ | 1,212 | ​ | $ | 414,933
Investments Classified by Contractual Maturity Date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​
After one through five years | ​ | $ | 1,002 | ​ | $ | 1,040
After five through ten years | ​ |  | 9,200 | ​ |  | 9,847
After ten years | ​ |  | 28,238 | ​ |  | 29,128
Securities not due on a single maturity date | ​ |  | 450,758 | ​ |  | 461,017
​ | ​ | $ | 489,198 | ​ | $ | 501,032
Schedule of Financial Instruments Owned and Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public deposits | ​ | $ | 4,742 | ​ | $ | 5,029 | ​ | $ | 5,674 | ​ | $ | 5,962
Collateralized borrowing accounts | ​ |  | 133,242 | ​ |  | 139,112 | ​ |  | 188,309 | ​ |  | 201,818
Other | ​ |  | 6,257 | ​ |  | 6,461 | ​ |  | 6,413 | ​ |  | 6,819
​ | ​ | $ | 144,241 | ​ | $ | 150,602 | ​ | $ | 200,396 | ​ | $ | 214,599
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 10,279 | ​ | $ | (831) | ​ | $ | — | ​ | $ | — | ​ | $ | 10,279 | ​ | $ | (831)
Agency collateralized mortgage obligations | ​ |  | 12,727 | ​ |  | (375) | ​ |  | — | ​ |  | — | ​ |  | 12,727 | ​ |  | (375)
States and political subdivisions securities | ​ |  | 1,164 | ​ |  | (6) | ​ |  | — | ​ |  | — | ​ |  | 1,164 | ​ |  | (6)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 24,170 | ​ | $ | (1,212) | ​ | $ | — | ​ | $ | — | ​ | $ | 24,170 | ​ | $ | (1,212)

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