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INVESTMENT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2024
INVESTMENT SECURITIES |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2024
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 312,068 |  | $ | — |  | $ | 40,816 |  | $ | 271,252
Agency collateralized mortgage obligations | ​ | ​ | 85,549 | ​ | ​ | — | ​ | ​ | 10,242 | ​ | ​ | 75,307
States and political subdivisions | ​ | ​ | 59,009 | ​ | ​ | 182 | ​ | ​ | 2,208 | ​ | ​ | 56,983
Small Business Administration securities | ​ | ​ | 69,609 | ​ | ​ | — | ​ | ​ | 7,843 | ​ | ​ | 61,766
​ |  | $ | 526,235 |  | $ | 182 |  | $ | 61,109 |  | $ | 465,308
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 72,194 | ​ | $ | 2,293 | ​ | $ | 74,487 | ​ | $ | — | ​ | $ | 9,210 | ​ | $ | 65,277
Agency collateralized mortgage obligations | ​ |  | 115,110 | ​ |  | (2,410) | ​ |  | 112,700 | ​ |  | — | ​ |  | 15,819 | ​ |  | 96,881
States and political subdivisions | ​ |  | 6,174 | ​ |  | 5 | ​ |  | 6,179 | ​ |  | — | ​ |  | 581 | ​ |  | 5,598
​ | ​ | $ | 193,478 | ​ | $ | (112) | ​ | $ | 193,366 | ​ | $ | — | ​ | $ | 25,610 | ​ | $ | 167,756
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 316,114 |  | $ | 7 |  | $ | 35,890 |  | $ | 280,231
Agency collateralized mortgage obligations | ​ | ​ | 85,989 | ​ | ​ | — | ​ | ​ | 10,043 | ​ | ​ | 75,946
States and political subdivisions securities | ​ | ​ | 59,141 | ​ | ​ | 527 | ​ | ​ | 1,531 | ​ | ​ | 58,137
Small Business Administration securities | ​ | ​ | 70,648 | ​ | ​ | — | ​ | ​ | 6,755 | ​ | ​ | 63,893
​ |  | $ | 531,892 |  | $ | 534 |  | $ | 54,219 |  | $ | 478,207
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 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 | ​ | $ | 72,495 | ​ | $ | 2,436 | ​ | $ | 74,931 | ​ | $ | — | ​ | $ | 8,686 | ​ | $ | 66,245
Agency collateralized mortgage obligations | ​ |  | 116,405 | ​ |  | (2,502) | ​ |  | 113,903 | ​ |  | — | ​ |  | 14,662 | ​ |  | 99,241
States and political subdivisions | ​ |  | 6,188 | ​ |  | 1 | ​ |  | 6,189 | ​ |  | — | ​ |  | 482 | ​ |  | 5,707
​ | ​ | $ | 195,088 | ​ | $ | (65) | ​ | $ | 195,023 | ​ | $ | — | ​ | $ | 23,830 | ​ | $ | 171,193
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 | ​ | ​ | 960 | ​ | ​ | 974 | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 10,726 | ​ | ​ | 10,534 | ​ | ​ | 3,247 | ​ | ​ | 2,931
After fifteen years | ​ | ​ | 47,078 | ​ | ​ | 45,230 | ​ | ​ | 2,932 | ​ | ​ | 2,667
Securities not due on a single maturity date | ​ | ​ | 467,226 | ​ | ​ | 408,325 | ​ | ​ | 187,187 | ​ | ​ | 162,158
​ | ​ | $ | 526,235 | ​ | $ | 465,308 | ​ | $ | 193,366 |  | $ | 167,756
Schedule of fair value and unrealized loss for available-for-sale securities and held-to-maturity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | 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 |  | $ | 5,369 | ​ | $ | (46) | ​ | $ | 265,883 | ​ | $ | (40,770) | ​ | $ | 271,252 | ​ | $ | (40,816)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 75,307 | ​ | ​ | (10,242) | ​ | ​ | 75,307 | ​ | ​ | (10,242)
Small Business Administration securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 61,766 | ​ | ​ | (7,843) | ​ | ​ | 61,766 | ​ | ​ | (7,843)
States and political subdivisions securities | ​ | ​ | 13,200 | ​ | ​ | (143) | ​ | ​ | 37,304 | ​ | ​ | (2,065) | ​ | ​ | 50,504 | ​ | ​ | (2,208)
​ |  | $ | 18,569 | ​ | $ | (189) | ​ | $ | 440,260 | ​ | $ | (60,920) | ​ | $ | 458,829 | ​ | $ | (61,109)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 65,277 | ​ | $ | (9,210) | ​ | $ | 65,277 | ​ | $ | (9,210)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 96,881 | ​ | ​ | (15,819) | ​ | ​ | 96,881 | ​ | ​ | (15,819)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,598 | ​ | ​ | (581) | ​ | ​ | 5,598 | ​ | ​ | (581)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 167,756 | ​ | $ | (25,610) | ​ | $ | 167,756 | ​ | $ | (25,610)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 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 |  | $ | 4,318 |  | $ | (9) |  | $ | 274,801 |  | $ | (35,881) |  | $ | 279,119 |  | $ | (35,890)
Agency collateralized mortgage obligations | ​ | ​ | 9,080 | ​ | ​ | (216) | ​ | ​ | 66,866 | ​ | ​ | (9,827) | ​ | ​ | 75,946 | ​ | ​ | (10,043)
Small Business Administration securities | ​ | ​ | 7,782 | ​ | ​ | (133) | ​ | ​ | 56,111 | ​ | ​ | (6,622) | ​ | ​ | 63,893 | ​ | ​ | (6,755)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 37,969 | ​ | ​ | (1,531) | ​ | ​ | 37,969 | ​ | ​ | (1,531)
​ |  | $ | 21,180 | ​ | $ | (358) |  | $ | 435,747 | ​ | $ | (53,861) |  | $ | 456,927 | ​ | $ | (54,219)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 66,245 | ​ | $ | (8,686) | ​ | $ | 66,245 | ​ | $ | (8,686)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 99,241 | ​ | ​ | (14,662) | ​ | ​ | 99,241 | ​ | ​ | (14,662)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,707 | ​ | ​ | (482) | ​ | ​ | 5,707 | ​ | ​ | (482)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 171,193 | ​ | $ | (23,830) | ​ | $ | 171,193 | ​ | $ | (23,830)
​

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and amortized cost (held-to-maturity), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References No definition available. + Details
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