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Note 2 - INVESTMENT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2025
INVESTMENT SECURITIES |
Schedule of amortized cost and fair value of HTM and AFS investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance |  | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit |  | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost |  | (Losses) |  | Gains |  | (Losses) |  | Value |
​ | ​ | (dollars in thousands) | ​
March 31, 2025: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 845,226 | ​ | $ | (254) | ​ | $ | 15,157 | ​ | $ | (102,476) | ​ | $ | 757,653 | ​
Corporate securities | ​ | ​ | 28,018 | ​ | ​ | (8) | ​ | ​ | 4,395 | ​ | ​ | — | ​ | ​ | 32,405 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | — | ​ |  | (3) | ​ |  | 1,046 | ​
​ | ​ | $ | 874,294 | ​ | $ | (263) | ​ | $ | 19,552 | ​ | $ | (102,479) | ​ | $ | 791,104 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 19,641 | ​ | $ | — | ​ | $ | 7 | ​ | $ | (2,161) | ​ | $ | 17,487 | ​
Residential mortgage-backed and related securities | ​ |  | 47,841 | ​ |  | — | ​ |  | 3 | ​ |  | (4,650) | ​ |  | 43,194 | ​
Municipal securities | ​ |  | 203,776 | ​ |  | — | ​ |  | — | ​ |  | (45,017) | ​ |  | 158,759 | ​
Asset-backed securities | ​ | ​ | 7,644 | ​ | ​ | — | ​ | ​ | 121 | ​ | ​ | (1) | ​ | ​ | 7,764 | ​
Corporate securities | ​ |  | 38,868 | ​ |  | — | ​ |  | 12 | ​ |  | (1,843) | ​ |  | 37,037 | ​
​ | ​ | $ | 317,770 | ​ | $ | — | ​ | $ | 143 | ​ | $ | (53,672) | ​ | $ | 264,241 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost | ​ | (Losses) | ​ | Gains |  | (Losses) | ​ | Value | ​
​ | ​ | (dollars in thousands) | ​
December 31, 2024: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Municipal securities | ​ | $ | 806,992 | ​ | $ | (254) | ​ | $ | 23,292 | ​ | $ | (63,164) | ​ | $ | 766,866 | ​
Corporate securities | ​ | ​ | 28,018 | ​ | ​ | (8) | ​ | ​ | 4,665 | ​ | ​ | — | ​ | ​ | 32,675 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | — | ​ |  | (7) | ​ |  | 1,042 | ​
​ | ​ | $ | 836,060 | ​ | $ | (263) | ​ | $ | 27,957 | ​ | $ | (63,171) | ​ | $ | 800,583 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 23,113 | ​ | $ | — | ​ | $ | 7 | ​ | $ | (2,529) | ​ | $ | 20,591 | ​
Residential mortgage-backed and related securities | ​ |  | 55,641 | ​ |  | — | ​ |  | 3 | ​ |  | (5,602) | ​ |  | 50,042 | ​
Municipal securities | ​ |  | 204,664 | ​ |  | — | ​ |  | — | ​ |  | (40,089) | ​ |  | 164,575 | ​
Asset-backed securities | ​ | ​ | 9,053 | ​ | ​ | — | ​ | ​ | 171 | ​ | ​ | — | ​ | ​ | 9,224 | ​
Corporate securities | ​ |  | 38,866 | ​ |  | — | ​ |  | 4 | ​ |  | (2,193) | ​ |  | 36,677 | ​
​ | ​ | $ | 331,337 | ​ | $ | — | ​ | $ | 185 | ​ | $ | (50,413) | ​ | $ | 281,109 | ​
Securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ | ​ | (dollars in thousands)
March 31, 2025: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 116,260 | ​ | $ | (35,513) | ​ | $ | 392,935 | ​ | $ | (66,963) | ​ | $ | 509,195 | ​ | $ | (102,476)
Other securities | ​ | ​ | 500 | ​ | ​ | (1) | ​ | ​ | 547 | ​ | ​ | (2) | ​ | ​ | 1,047 | ​ | ​ | (3)
​ | ​ | $ | 116,760 | ​ | $ | (35,514) | ​ | $ | 393,482 | ​ | $ | (66,965) | ​ | $ | 510,242 | ​ | $ | (102,479)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 3,346 | ​ | $ | (1) | ​ | $ | 13,551 | ​ | $ | (2,160) | ​ | $ | 16,897 | ​ | $ | (2,161)
Residential mortgage-backed and related securities | ​ |  | 1,261 | ​ |  | (9) | ​ |  | 41,752 | ​ |  | (4,641) | ​ |  | 43,013 | ​ |  | (4,650)
Municipal securities | ​ |  | 789 | ​ |  | (10) | ​ |  | 157,969 | ​ |  | (45,007) | ​ |  | 158,759 | ​ |  | (45,017)
Asset-backed securities | ​ | ​ | 2,730 | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,730 | ​ | ​ | (1)
Corporate securities | ​ |  | — | ​ |  | — | ​ |  | 33,841 | ​ |  | (1,843) | ​ |  | 33,841 | ​ |  | (1,843)
​ | ​ | $ | 8,126 | ​ | $ | (21) | ​ | $ | 247,113 | ​ | $ | (53,651) | ​ | $ | 255,240 | ​ | $ | (53,672)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ | ​ | (dollars in thousands)
December 31, 2024: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 162,914 | ​ | $ | (14,382) | ​ | $ | 253,818 | ​ | $ | (48,782) | ​ | $ | 416,732 | ​ | $ | (63,164)
Other securities | ​ |  | 500 | ​ | ​ | — | ​ | ​ | 543 | ​ | ​ | (7) | ​ | ​ | 1,043 | ​ | ​ | (7)
​ | ​ | $ | 163,414 | ​ | $ | (14,382) | ​ | $ | 254,361 | ​ | $ | (48,789) | ​ | $ | 417,775 | ​ | $ | (63,171)
​ | ​ | ​ |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 6,522 | ​ | $ | (2) | ​ | $ | 13,369 | ​ | $ | (2,527) | ​ | $ | 19,891 | ​ | $ | (2,529)
Residential mortgage-backed and related securities | ​ |  | 1,337 | ​ |  | (24) | ​ |  | 48,520 | ​ |  | (5,578) | ​ |  | 49,857 | ​ |  | (5,602)
Municipal securities | ​ |  | 798 | ​ |  | (6) | ​ |  | 163,777 | ​ |  | (40,083) | ​ |  | 164,575 | ​ |  | (40,089)
Corporate securities | ​ | ​ | — | ​ |  | — | ​ |  | 35,712 | ​ |  | (2,193) | ​ |  | 35,712 | ​ |  | (2,193)
​ | ​ | $ | 8,657 | ​ | $ | (32) | ​ | $ | 261,378 | ​ | $ | (50,381) | ​ | $ | 270,035 | ​ | $ | (50,413)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of activity in allowance for credit losses for HTM and AFS securities by major security | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended March 31, 2025 | ​ | Three Months Ended March 31, 2024
​ | ​ | ​ | Securities HTM | ​ | Securities AFS | ​ | Securities HTM | ​ | Securities AFS
​ | ​ | ​ | Municipal | ​ | Corporate | ​ | Other | ​ | ​ | ​ | Corporate | ​ | Municipal | ​ | Other | ​ | ​ | ​ | ​ | Corporate
​ |  | ​ | securities | ​ | securities | ​ | securities | ​ | Total |  | securities | ​ | securities |  | securities | ​ | ​ | Total |  | securities
​ |  | ​ | (dollars in thousands)
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | ​ | $ | 254 | ​ | $ | 8 | ​ | $ | 1 | ​ | $ | 263 | ​ | $ | — | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | 989
Reduction due to sales | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (544)
Provision | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (445)
Balance, ending | ​ | ​ | $ | 254 | ​ | $ | 8 | ​ | $ | 1 | ​ | $ | 263 | ​ | $ | — | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | —
Schedule of realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Three Months Ended |  |
​ | ​ | ​ | ​ | ​ | March 31, 2025 | ​ | March 31, 2024 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | (dollars in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | $ | — | ​ | $ | 445 | ​ | ​
Gross gains from sales of securities | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ | ​
Gross losses from sales of securities | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ | ​
Schedule of investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 1,230 | ​ | $ | 1,227
Due after one year through five years | ​ |  | 29,343 | ​ |  | 26,735
Due after five years | ​ |  | 843,721 | ​ |  | 763,142
​ | ​ | $ | 874,294 | ​ | $ | 791,104
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 3,279 | ​ | $ | 3,277
Due after one year through five years | ​ |  | 20,105 | ​ |  | 19,370
Due after five years | ​ |  | 238,901 | ​ |  | 190,636
​ | ​ | ​ | 262,285 | ​ | ​ | 213,283
Residential mortgage-backed and related securities | ​ | ​ | 47,841 | ​ | ​ | 43,194
Asset-backed securities | ​ |  | 7,644 | ​ |  | 7,764
​ | ​ | $ | 317,770 | ​ | $ | 264,241
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | ​ | 281,875 | ​ | ​ | 266,459
Corporate securities | ​ | ​ | 28,018 | ​ | ​ | 32,404
​ | ​ | $ | 309,893 | ​ | $ | 298,863
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 203,630 | ​ | ​ | 158,627
Corporate securities | ​ |  | 37,905 | ​ |  | 36,068
​ | ​ | $ | 241,535 | ​ | $ | 194,695

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