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INVESTMENT SECURITIES (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Investments in Securities |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2022
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 305,885 |  | $ | 928 |  | $ | 9,337 |  | $ | 297,476
Agency collateralized mortgage obligations | ​ | ​ | 78,199 | ​ | ​ | 73 | ​ | ​ | 5,263 | ​ | ​ | 73,009
States and political subdivisions | ​ | ​ | 41,202 | ​ | ​ | 221 | ​ | ​ | 426 | ​ | ​ | 40,997
Small Business Administration securities | ​ | ​ | 50,428 | ​ | ​ | 441 | ​ | ​ | 976 | ​ | ​ | 49,893
​ |  | $ | 475,714 |  | $ | 1,663 |  | $ | 16,002 |  | $ | 461,375
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | ​ | 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 classified as held-to-maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 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 | ​ | $ | 88,542 | ​ | $ | 4,424 | ​ | $ | 92,966 | ​ | $ | — | ​ | $ | 2,966 | ​ | $ | 90,000
Agency collateralized mortgage obligations | ​ |  | 131,638 | ​ |  | (3,420) | ​ |  | 128,218 | ​ |  | — | ​ |  | 4,023 | ​ |  | 124,195
States and political subdivisions | ​ |  | 6,278 | ​ |  | (21) | ​ |  | 6,257 | ​ |  | — | ​ |  | 264 | ​ |  | 5,993
​ | ​ | $ | 226,458 | ​ | $ | 983 | ​ | $ | 227,441 | ​ | $ | — | ​ | $ | 7,253 | ​ | $ | 220,188
Investments Classified by Contractual Maturity Date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | ​ | 2,292 | ​ | ​ | 2,318 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 13,081 | ​ | ​ | 13,208 | ​ | ​ | 2,575 | ​ | ​ | 2,440
After fifteen years | ​ | ​ | 25,831 | ​ | ​ | 25,474 | ​ | ​ | 3,681 | ​ | ​ | 3,553
Securities not due on a single maturity date | ​ | ​ | 434,510 | ​ | ​ | 420,375 | ​ | ​ | 221,185 | ​ | ​ | 214,195
​ | ​ | $ | 475,714 | ​ | $ | 461,375 | ​ | $ | 227,441 |  | $ | 220,188
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 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 |  | $ | 244,661 |  | $ | (9,337) |  | $ | — |  | $ | — |  | $ | 244,661 |  | $ | (9,337)
Agency collateralized mortgage obligations | ​ | ​ | 25,813 | ​ | ​ | (1,177) | ​ | ​ | 34,761 | ​ | ​ | (4,086) | ​ | ​ | 60,574 | ​ | ​ | (5,263)
States and political subdivisions securities | ​ | ​ | 17,527 | ​ | ​ | (179) | ​ | ​ | 3,976 | ​ | ​ | (247) | ​ | ​ | 21,503 | ​ | ​ | (426)
Small Business Administration securities | ​ | ​ | 24,804 | ​ | ​ | (976) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 24,804 | ​ | ​ | (976)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 312,805 |  | $ | (11,669) |  | $ | 38,737 |  | $ | (4,333) |  | $ | 351,542 |  | $ | (16,002)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 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 | ​ | $ | 80,283 | ​ | $ | (2,662) | ​ | $ | 9,717 | ​ | $ | (304) | ​ | $ | 90,000 | ​ | $ | (2,966)
Agency collateralized mortgage obligations | ​ |  | 70,764 | ​ |  | (1,772) | ​ |  | 53,431 | ​ |  | (2,251) | ​ |  | 124,195 | ​ |  | (4,023)
States and political subdivisions securities | ​ |  | 932 | ​ |  | (58) | ​ |  | 5,061 | ​ |  | (206) | ​ |  | 5,993 | ​ |  | (264)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 151,979 | ​ | $ | (4,492) | ​ | $ | 68,209 | ​ | $ | (2,761) | ​ | $ | 220,188 | ​ | $ | (7,253)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 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)
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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