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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2024
INVESTMENT SECURITIES |
Schedule of amortized cost and fair values of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2024
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ |  | (In Thousands)
AVAILABLE-FOR-SALE SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities |  | $ | 357,905 |  | $ | 54 |  | $ | 41,895 |  | $ | 316,064
Agency collateralized mortgage obligations | ​ | ​ | 126,457 | ​ | ​ | — | ​ | ​ | 10,493 | ​ | ​ | 115,964
States and political subdivisions | ​ | ​ | 58,876 | ​ | ​ | 126 | ​ | ​ | 2,349 | ​ | ​ | 56,653
Small Business Administration securities | ​ | ​ | 68,535 | ​ | ​ | — | ​ | ​ | 8,132 | ​ | ​ | 60,403
​ |  | $ | 611,773 |  | $ | 180 |  | $ | 62,869 |  | $ | 549,084
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 | ​ | $ | 71,676 | ​ | $ | 2,147 | ​ | $ | 73,823 | ​ | $ | — | ​ | $ | 9,310 | ​ | $ | 64,513
Agency collateralized mortgage obligations | ​ |  | 113,547 | ​ |  | (2,316) | ​ |  | 111,231 | ​ |  | — | ​ |  | 16,081 | ​ |  | 95,150
States and political subdivisions | ​ |  | 6,162 | ​ |  | 8 | ​ |  | 6,170 | ​ |  | — | ​ |  | 668 | ​ |  | 5,502
​ | ​ | $ | 191,385 | ​ | $ | (161) | ​ | $ | 191,224 | ​ | $ | — | ​ | $ | 26,059 | ​ | $ | 165,165
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​ | ​ | 245 | ​ | ​ | 245 | ​ | ​ | — | ​ | ​ | —
After three through four years | ​ | ​ | 969 | ​ | ​ | 969 | ​ | ​ | — | ​ | ​ | —
After four through five years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
After five through fifteen years | ​ | ​ | 10,689 | ​ | ​ | 10,448 | ​ | ​ | 3,246 | ​ | ​ | 2,889
After fifteen years | ​ | ​ | 46,973 | ​ | ​ | 44,991 | ​ | ​ | 2,924 | ​ | ​ | 2,613
Securities not due on a single maturity date | ​ | ​ | 552,897 | ​ | ​ | 492,431 | ​ | ​ | 185,054 | ​ | ​ | 159,663
​ | ​ | $ | 611,773 | ​ | $ | 549,084 | ​ | $ | 191,224 |  | $ | 165,165
Schedule of fair value and unrealized loss for available-for-sale securities and held-to-maturity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 |  | $ | 49,031 | ​ | $ | (813) | ​ | $ | 260,805 | ​ | $ | (41,082) | ​ | $ | 309,836 | ​ | $ | (41,895)
Agency collateralized mortgage obligations | ​ | ​ | 41,393 | ​ | ​ | (297) | ​ | ​ | 74,572 | ​ | ​ | (10,196) | ​ | ​ | 115,965 | ​ | ​ | (10,493)
States and political subdivisions securities | ​ | ​ | 10,228 | ​ | ​ | (183) | ​ | ​ | 37,070 | ​ | ​ | (2,166) | ​ | ​ | 47,298 | ​ | ​ | (2,349)
Small Business Administration securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 60,402 | ​ | ​ | (8,132) | ​ | ​ | 60,402 | ​ | ​ | (8,132)
​ |  | $ | 100,652 | ​ | $ | (1,293) | ​ | $ | 432,849 | ​ | $ | (61,576) | ​ | $ | 533,501 | ​ | $ | (62,869)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
HELD-TO-MATURITY SECURITIES: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency mortgage-backed securities | ​ | $ | — | ​ | $ | — | ​ | $ | 64,513 | ​ | $ | (9,310) | ​ | $ | 64,513 | ​ | $ | (9,310)
Agency collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 95,150 | ​ | ​ | (16,081) | ​ | ​ | 95,150 | ​ | ​ | (16,081)
States and political subdivisions securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,502 | ​ | ​ | (668) | ​ | ​ | 5,502 | ​ | ​ | (668)
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 165,165 | ​ | $ | (26,059) | ​ | $ | 165,165 | ​ | $ | (26,059)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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)
States and political subdivisions securities | ​ | ​ | 7,782 | ​ | ​ | (133) | ​ | ​ | 56,111 | ​ | ​ | (6,622) | ​ | ​ | 63,893 | ​ | ​ | (6,755)
Small Business Administration 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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