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Investments in Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments in Securities |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 156,591 |  | $ | 8,716 |  | $ | 265 |  | $ | 165,042
Agency collateralized mortgage obligations | ​ | ​ | 149,980 | ​ | ​ | 2,891 | ​ | ​ | 921 | ​ | ​ | 151,950
States and political subdivisions securities | ​ | ​ | 33,757 | ​ | ​ | 1,368 | ​ | ​ | — | ​ | ​ | 35,125
Small Business Administration securities | ​ | ​ | 22,132 | ​ | ​ | — | ​ | ​ | 74 | ​ | ​ | 22,058
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 362,460 |  | $ | 12,975 |  | $ | 1,260 |  | $ | 374,175
Investments Classified by Contractual Maturity Date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​
After one through five years | ​ | $ | — | ​ | $ | —
After five through ten years | ​ |  | 8,672 | ​ |  | 9,251
After ten years | ​ |  | 36,524 | ​ |  | 38,074
Securities not due on a single maturity date | ​ |  | 339,611 | ​ |  | 367,608
​ | ​ | $ | 384,807 | ​ | $ | 414,933
Schedule of Financial Instruments Owned and Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value |  | Cost |  | Value
​ |  | (In Thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public deposits | ​ | $ | 5,674 | ​ | $ | 5,962 | ​ | $ | 8,578 | ​ | $ | 8,913
Collateralized borrowing accounts | ​ |  | 188,309 | ​ |  | 201,818 | ​ |  | 122,771 | ​ |  | 129,643
Other | ​ |  | 6,413 | ​ |  | 6,819 | ​ |  | 7,021 | ​ |  | 7,107
​ | ​ | $ | 200,396 | ​ | $ | 214,599 | ​ | $ | 138,370 | ​ | $ | 145,663
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
Small Business Administration securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
States and political subdivisions securities | ​ |  | 1,164 | ​ |  | (6) | ​ |  | — | ​ |  | — | ​ |  | 1,164 | ​ |  | (6)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 24,170 | ​ | $ | (1,212) | ​ | $ | — | ​ | $ | — | ​ | $ | 24,170 | ​ | $ | (1,212)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019
​ | ​ | 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 24,762 | ​ | $ | (265) | ​ | $ | 24,762 | ​ | $ | (265)
Agency collateralized mortgage obligations | ​ | ​ | 69,372 | ​ | ​ | (921) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 69,372 | ​ | ​ | (921)
Small Business Administration securities | ​ |  | 22,058 | ​ |  | (74) | ​ |  | — | ​ |  | — | ​ |  | 22,058 | ​ |  | (74)
States and political subdivisions securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 91,430 | ​ | $ | (995) | ​ | $ | 24,762 | ​ | $ | (265) | ​ | $ | 116,192 | ​ | $ | (1,260)

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