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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
INVESTMENT SECURITIES |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 157,316 |  | $ | 12,402 |  | $ | 898 |  | $ | 168,820
Agency collateralized mortgage obligations | ​ | ​ | 203,680 | ​ | ​ | 3,688 | ​ | ​ | 1,637 | ​ | ​ | 205,731
States and political subdivisions | ​ | ​ | 38,571 | ​ | ​ | 1,582 | ​ | ​ | 116 | ​ | ​ | 40,037
Small Business Administration securities | ​ | ​ | 17,781 | ​ | ​ | 569 | ​ | ​ | — | ​ | ​ | 18,350
​ |  | $ | 417,348 |  | $ | 18,241 |  | $ | 2,651 |  | $ | 432,938
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ | ​ | 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)
One year or less |  | $ | — |  | $ | —
After one through five years | ​ | ​ | 1,002 | ​ | ​ | 1,045
After five through ten years | ​ | ​ | 9,202 | ​ | ​ | 9,882
After ten years | ​ | ​ | 28,367 | ​ | ​ | 29,110
Securities not due on a single maturity date | ​ | ​ | 378,777 | ​ | ​ | 392,901
​ |  | $ | 417,348 |  | $ | 432,938
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 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 |  | $ | 10,084 |  | $ | (898) |  | $ | — |  | $ | — |  | $ | 10,084 |  | $ | (898)
Agency collateralized mortgage obligations | ​ | ​ | 67,941 | ​ | ​ | (963) | ​ | ​ | 12,418 | ​ | ​ | (674) | ​ | ​ | 80,359 | ​ | ​ | (1,637)
States and political subdivisions securities | ​ | ​ | 8,578 | ​ | ​ | (116) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,578 | ​ | ​ | (116)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 86,603 |  | $ | (1,977) |  | $ | 12,418 |  | $ | (674) |  | $ | 99,021 |  | $ | (2,651)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 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)
​

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