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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2023
INVESTMENT SECURITIES |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2023
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 319,237 |  | $ | — |  | $ | 40,743 |  | $ | 278,494
Agency collateralized mortgage obligations | ​ | ​ | 87,777 | ​ | ​ | — | ​ | ​ | 11,277 | ​ | ​ | 76,500
States and political subdivisions | ​ | ​ | 59,403 | ​ | ​ | 207 | ​ | ​ | 2,887 | ​ | ​ | 56,723
Small Business Administration securities | ​ | ​ | 72,740 | ​ | ​ | — | ​ | ​ | 7,546 | ​ | ​ | 65,194
​ |  | $ | 539,157 |  | $ | 207 |  | $ | 62,453 |  | $ | 476,911
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023
​ | ​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 73,195 | ​ | $ | 2,726 | ​ | $ | 75,921 | ​ | $ | — | ​ | $ | 10,034 | ​ | $ | 65,887
Agency collateralized mortgage obligations | ​ |  | 118,932 | ​ |  | (2,674) | ​ |  | 116,258 | ​ |  | — | ​ |  | 14,013 | ​ |  | 102,245
States and political subdivisions | ​ |  | 6,213 | ​ |  | (5) | ​ |  | 6,208 | ​ |  | — | ​ |  | 679 | ​ |  | 5,529
​ | ​ | $ | 198,340 | ​ | $ | 47 | ​ | $ | 198,387 | ​ | $ | — | ​ | $ | 24,726 | ​ | $ | 173,661
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 327,266 |  | $ | — |  | $ | 40,784 |  | $ | 286,482
Agency collateralized mortgage obligations | ​ | ​ | 90,205 | ​ | ​ | — | ​ | ​ | 11,731 | ​ | ​ | 78,474
States and political subdivisions securities | ​ | ​ | 60,667 | ​ | ​ | 119 | ​ | ​ | 3,291 | ​ | ​ | 57,495
Small Business Administration securities | ​ | ​ | 75,076 | ​ | ​ | — | ​ | ​ | 6,935 | ​ | ​ | 68,141
​ |  | $ | 553,214 |  | $ | 119 |  | $ | 62,741 |  | $ | 490,592
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 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 | ​ | $ | 73,891 | ​ | $ | 3,015 | ​ | $ | 76,906 | ​ | $ | — | ​ | $ | 9,820 | ​ | $ | 67,086
Agency collateralized mortgage obligations | ​ |  | 122,247 | ​ |  | (2,885) | ​ |  | 119,362 | ​ |  | — | ​ |  | 14,129 | ​ |  | 105,233
States and political subdivisions | ​ |  | 6,239 | ​ |  | (12) | ​ |  | 6,227 | ​ |  | — | ​ |  | 781 | ​ |  | 5,446
​ | ​ | $ | 202,377 | ​ | $ | 118 | ​ | $ | 202,495 | ​ | $ | — | ​ | $ | 24,730 | ​ | $ | 177,765
Schedule of amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | 936 | ​ | ​ | 940 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 6,365 | ​ | ​ | 6,135 | ​ | ​ | 3,250 | ​ | ​ | 2,896
After fifteen years | ​ | ​ | 51,857 | ​ | ​ | 49,403 | ​ | ​ | 2,958 | ​ | ​ | 2,633
Securities not due on a single maturity date | ​ | ​ | 479,754 | ​ | ​ | 420,188 | ​ | ​ | 192,179 | ​ | ​ | 168,132
​ | ​ | $ | 539,157 | ​ | $ | 476,911 | ​ | $ | 198,387 |  | $ | 173,661
Schedule of fair value and unrealized loss for available-for-sale securities and held-to-maturity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023
​ | ​ | 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 |  | $ | 2,972 | ​ | $ | (245) | ​ | $ | 275,522 | ​ | $ | (40,498) | ​ | $ | 278,494 | ​ | $ | (40,743)
Agency collateralized mortgage obligations | ​ | ​ | 8,908 | ​ | ​ | (390) | ​ | ​ | 67,592 | ​ | ​ | (10,887) | ​ | ​ | 76,500 | ​ | ​ | (11,277)
States and political subdivisions securities | ​ | ​ | 10,348 | ​ | ​ | (106) | ​ | ​ | 36,979 | ​ | ​ | (2,781) | ​ | ​ | 47,327 | ​ | ​ | (2,887)
Small Business Administration securities | ​ | ​ | 7,905 | ​ | ​ | (187) | ​ | ​ | 57,289 | ​ | ​ | (7,359) | ​ | ​ | 65,194 | ​ | ​ | (7,546)
​ |  | $ | 30,133 | ​ | $ | (928) | ​ | $ | 437,382 | ​ | $ | (61,525) | ​ | $ | 467,515 | ​ | $ | (62,453)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 65,887 | ​ | $ | (10,034) | ​ | $ | 65,887 | ​ | $ | (10,034)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 102,245 | ​ | ​ | (14,013) | ​ | ​ | 102,245 | ​ | ​ | (14,013)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,529 | ​ | ​ | (679) | ​ | ​ | 5,529 | ​ | ​ | (679)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 173,661 | ​ | $ | (24,726) | ​ | $ | 173,661 | ​ | $ | (24,726)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 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 |  | $ | 221,562 |  | $ | (27,597) |  | $ | 64,918 |  | $ | (13,187) |  | $ | 286,480 |  | $ | (40,784)
Agency collateralized mortgage obligations | ​ | ​ | 28,537 | ​ | ​ | (3,262) | ​ | ​ | 40,642 | ​ | ​ | (8,469) | ​ | ​ | 69,179 | ​ | ​ | (11,731)
States and political subdivisions securities | ​ | ​ | 60,473 | ​ | ​ | (5,224) | ​ | ​ | 7,667 | ​ | ​ | (1,711) | ​ | ​ | 68,140 | ​ | ​ | (6,935)
Small Business Administration securities | ​ | ​ | 44,455 | ​ | ​ | (2,913) | ​ | ​ | 3,753 | ​ | ​ | (378) | ​ | ​ | 48,208 | ​ | ​ | (3,291)
​ |  | $ | 355,027 | ​ | $ | (38,996) |  | $ | 116,980 | ​ | $ | (23,745) |  | $ | 472,007 | ​ | $ | (62,741)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | 59,218 | ​ | $ | (7,766) | ​ | $ | 7,868 | ​ | $ | (2,054) | ​ | $ | 67,086 | ​ | $ | (9,820)
Agency collateralized mortgage obligations | ​ | ​ | 61,055 | ​ | ​ | (6,411) | ​ | ​ | 44,178 | ​ | ​ | (7,718) | ​ | ​ | 105,233 | ​ | ​ | (14,129)
States and political subdivisions securities | ​ | ​ | 900 | ​ | ​ | (101) | ​ | ​ | 4,546 | ​ | ​ | (680) | ​ | ​ | 5,446 | ​ | ​ | (781)
​ | ​ | $ | 121,173 | ​ | $ | (14,278) | ​ | $ | 56,592 | ​ | $ | (10,452) | ​ | $ | 177,765 | ​ | $ | (24,730)
​

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