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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments in Securities |
Investment Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2022
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 336,176 |  | $ | 18 |  | $ | 24,000 |  | $ | 312,194
Agency collateralized mortgage obligations | ​ | ​ | 82,992 | ​ | ​ | — | ​ | ​ | 7,718 | ​ | ​ | 75,274
States and political subdivisions | ​ | ​ | 67,548 | ​ | ​ | 151 | ​ | ​ | 2,337 | ​ | ​ | 65,362
Small Business Administration securities | ​ | ​ | 69,530 | ​ | ​ | — | ​ | ​ | 2,888 | ​ | ​ | 66,642
​ |  | $ | 556,246 |  | $ | 169 |  | $ | 36,943 |  | $ | 519,472
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 | ​ | $ | 80,331 | ​ | $ | 3,583 | ​ | $ | 83,914 | ​ | $ | — | ​ | $ | 6,476 | ​ | $ | 77,438
Agency collateralized mortgage obligations | ​ |  | 128,435 | ​ |  | (3,242) | ​ |  | 125,193 | ​ |  | — | ​ |  | 8,916 | ​ |  | 116,277
States and political subdivisions | ​ |  | 6,265 | ​ |  | (18) | ​ |  | 6,247 | ​ |  | — | ​ |  | 709 | ​ |  | 5,538
​ | ​ | $ | 215,031 | ​ | $ | 323 | ​ | $ | 215,354 | ​ | $ | — | ​ | $ | 16,101 | ​ | $ | 199,253
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 | ​ | ​ | 2,289 | ​ | ​ | 2,297 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 14,524 | ​ | ​ | 14,358 | ​ | ​ | 2,576 | ​ | ​ | 2,253
After fifteen years | ​ | ​ | 50,736 | ​ | ​ | 48,709 | ​ | ​ | 3,670 | ​ | ​ | 3,284
Securities not due on a single maturity date | ​ | ​ | 488,697 | ​ | ​ | 454,108 | ​ | ​ | 209,108 | ​ | ​ | 193,716
​ | ​ | $ | 556,246 | ​ | $ | 519,472 | ​ | $ | 215,354 |  | $ | 199,253
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 |  | $ | 303,739 |  | $ | (24,000) |  | $ | — |  | $ | — |  | $ | 303,739 |  | $ | (24,000)
Agency collateralized mortgage obligations | ​ | ​ | 64,794 | ​ | ​ | (5,116) | ​ | ​ | 10,479 | ​ | ​ | (2,602) | ​ | ​ | 75,273 | ​ | ​ | (7,718)
States and political subdivisions securities | ​ | ​ | 48,137 | ​ | ​ | (2,337) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 48,137 | ​ | ​ | (2,337)
Small Business Administration securities | ​ | ​ | 66,642 | ​ | ​ | (2,888) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 66,642 | ​ | ​ | (2,888)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | $ | 483,312 |  | $ | (34,341) |  | $ | 10,479 |  | $ | (2,602) |  | $ | 493,791 |  | $ | (36,943)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 | ​ | $ | 69,001 | ​ | $ | (4,925) | ​ | $ | 8,437 | ​ | $ | (1,551) | ​ | $ | 77,438 | ​ | $ | (6,476)
Agency collateralized mortgage obligations | ​ |  | 109,116 | ​ |  | (8,439) | ​ |  | 7,161 | ​ |  | (477) | ​ |  | 116,277 | ​ |  | (8,916)
States and political subdivisions securities | ​ |  | 3,227 | ​ |  | (417) | ​ |  | 2,311 | ​ |  | (292) | ​ |  | 5,538 | ​ |  | (709)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 181,344 | ​ | $ | (13,781) | ​ | $ | 17,909 | ​ | $ | (2,320) | ​ | $ | 199,253 | ​ | $ | (16,101)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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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