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INVESTMENT SECURITIES (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
INVESTMENT SECURITIES |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2021
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 159,967 |  | $ | 11,283 |  | $ | 1,482 |  | $ | 169,768
Agency collateralized mortgage obligations | ​ | ​ | 226,494 | ​ | ​ | 4,182 | ​ | ​ | 3,594 | ​ | ​ | 227,082
States and political subdivisions | ​ | ​ | 39,833 | ​ | ​ | 1,546 | ​ | ​ | 149 | ​ | ​ | 41,230
Small Business Administration securities | ​ | ​ | 19,272 | ​ | ​ | 316 | ​ | ​ | — | ​ | ​ | 19,588
​ |  | $ | 445,566 |  | $ | 17,327 |  | $ | 5,225 |  | $ | 457,668
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | ​ | — | ​ | ​ | —
After five through ten years | ​ | ​ | 9,929 | ​ | ​ | 10,471
After ten years | ​ | ​ | 29,904 | ​ | ​ | 30,759
Securities not due on a single maturity date | ​ | ​ | 405,733 | ​ | ​ | 416,438
​ |  | $ | 445,566 |  | $ | 457,668
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 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 |  | $ | 19,668 |  | $ | (1,482) |  | $ | — |  | $ | — |  | $ | 19,668 |  | $ | (1,482)
Agency collateralized mortgage obligations | ​ | ​ | 105,043 | ​ | ​ | (3,594) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 105,043 | ​ | ​ | (3,594)
States and political subdivisions securities | ​ | ​ | 9,773 | ​ | ​ | (149) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,773 | ​ | ​ | (149)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 134,484 |  | $ | (5,225) |  | $ | — |  | $ | — |  | $ | 134,484 |  | $ | (5,225)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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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