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Note 2 - INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 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) | ​
June 30, 2025: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 879,663 | ​ | $ | (254) | ​ | $ | 11,203 | ​ | $ | (120,662) | ​ | $ | 769,950 | ​
Corporate securities | ​ | ​ | 28,585 | ​ | ​ | (8) | ​ | ​ | 3,991 | ​ | ​ | — | ​ | ​ | 32,568 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | — | ​ |  | (2) | ​ |  | 1,047 | ​
​ | ​ | $ | 909,298 | ​ | $ | (263) | ​ | $ | 15,194 | ​ | $ | (120,664) | ​ | $ | 803,565 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 16,268 | ​ | $ | — | ​ | $ | 3 | ​ | $ | (2,004) | ​ | $ | 14,267 | ​
Residential mortgage-backed and related securities | ​ |  | 63,364 | ​ |  | — | ​ |  | 6 | ​ |  | (4,506) | ​ |  | 58,864 | ​
Municipal securities | ​ |  | 204,038 | ​ |  | — | ​ |  | — | ​ |  | (50,059) | ​ |  | 153,979 | ​
Asset-backed securities | ​ | ​ | 6,599 | ​ | ​ | — | ​ | ​ | 85 | ​ | ​ | — | ​ | ​ | 6,684 | ​
Corporate securities | ​ |  | 39,373 | ​ |  | — | ​ |  | 33 | ​ |  | (1,683) | ​ |  | 37,723 | ​
​ | ​ | $ | 329,642 | ​ | $ | — | ​ | $ | 127 | ​ | $ | (58,252) | ​ | $ | 271,517 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 | ​
Schedule of 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)
June 30, 2025: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 276,990 | ​ | $ | (48,221) | ​ | $ | 279,489 | ​ | $ | (72,441) | ​ | $ | 556,479 | ​ | $ | (120,662)
Other securities | ​ | ​ | 500 | ​ | ​ | (1) | ​ | ​ | 548 | ​ | ​ | (1) | ​ | ​ | 1,048 | ​ | ​ | (2)
​ | ​ | $ | 277,490 | ​ | $ | (48,222) | ​ | $ | 280,037 | ​ | $ | (72,442) | ​ | $ | 557,527 | ​ | $ | (120,664)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 62 | ​ | $ | (1) | ​ | $ | 13,643 | ​ | $ | (2,003) | ​ | $ | 13,705 | ​ | $ | (2,004)
Residential mortgage-backed and related securities | ​ |  | 13,977 | ​ |  | (152) | ​ |  | 35,931 | ​ |  | (4,354) | ​ |  | 49,908 | ​ |  | (4,506)
Municipal securities | ​ |  | 1,400 | ​ |  | (44) | ​ |  | 152,579 | ​ |  | (50,015) | ​ |  | 153,979 | ​ |  | (50,059)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Corporate securities | ​ |  | — | ​ |  | — | ​ |  | 31,503 | ​ |  | (1,683) | ​ |  | 31,503 | ​ |  | (1,683)
​ | ​ | $ | 15,439 | ​ | $ | (197) | ​ | $ | 233,656 | ​ | $ | (58,055) | ​ | $ | 249,095 | ​ | $ | (58,252)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | ​ | ​
​ | ​ | June 30, 2025 | ​ | June 30, 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 | ​ | $ | —
Provision | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance, ending | ​ | $ | 254 | ​ | $ | 8 | ​ | $ | 1 | ​ | $ | 263 | ​ | $ | — | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30, 2025 | ​ | June 30, 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 for credit loss expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (445)
Balance, ending | ​ | $ | 254 | ​ | ​ | 8 | ​ | $ | 1 | ​ | $ | 263 | ​ | $ | — | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | —
Schedule of realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Three Months Ended |  | Six Months Ended |
​ | ​ | ​ | ​ | ​ | June 30, 2025 | ​ | June 30, 2024 | ​ | June 30, 2025 | ​ | June 30, 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 | ​ | $ | 359 | ​ | $ | 357
Due after one year through five years | ​ |  | 28,143 | ​ |  | 26,320
Due after five years | ​ |  | 880,796 | ​ |  | 776,888
​ | ​ | $ | 909,298 | ​ | $ | 803,565
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ |  | 21,598 | ​ |  | 20,870
Due after five years | ​ |  | 238,081 | ​ |  | 185,099
​ | ​ | ​ | 259,679 | ​ | ​ | 205,969
Residential mortgage-backed and related securities | ​ | ​ | 63,364 | ​ | ​ | 58,864
Asset-backed securities | ​ |  | 6,599 | ​ |  | 6,684
​ | ​ | $ | 329,642 | ​ | $ | 271,517
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 254,089 | ​ | $ | 244,000
Corporate securities | ​ | ​ | 28,585 | ​ | ​ | 32,567
​ | ​ | $ | 282,674 | ​ | $ | 276,567
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 203,893 | ​ | $ | 153,844
Corporate securities | ​ |  | 35,408 | ​ |  | 33,739
​ | ​ | $ | 239,301 | ​ | $ | 187,583

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