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Note 2 - INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 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) | ​
September 30, 2025: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 924,179 | ​ | $ | (254) | ​ | $ | 17,002 | ​ | $ | (119,656) | ​ | $ | 821,271 | ​
Corporate securities | ​ | ​ | 29,149 | ​ | ​ | (8) | ​ | ​ | 3,583 | ​ | ​ | — | ​ | ​ | 32,724 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | — | ​ |  | — | ​ |  | 1,049 | ​
​ | ​ | $ | 954,378 | ​ | $ | (263) | ​ | $ | 20,585 | ​ | $ | (119,656) | ​ | $ | 855,044 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 16,076 | ​ | $ | — | ​ | $ | 2 | ​ | $ | (1,870) | ​ | $ | 14,208 | ​
Residential mortgage-backed and related securities | ​ |  | 60,800 | ​ |  | — | ​ |  | 245 | ​ |  | (3,937) | ​ |  | 57,108 | ​
Municipal securities | ​ |  | 203,826 | ​ |  | — | ​ |  | 31 | ​ |  | (42,367) | ​ |  | 161,490 | ​
Asset-backed securities | ​ | ​ | 4,822 | ​ | ​ | — | ​ | ​ | 96 | ​ | ​ | — | ​ | ​ | 4,918 | ​
Corporate securities | ​ |  | 34,688 | ​ |  | — | ​ |  | 109 | ​ |  | (1,172) | ​ |  | 33,625 | ​
​ | ​ | $ | 320,212 | ​ | $ | — | ​ | $ | 483 | ​ | $ | (49,346) | ​ | $ | 271,349 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
September 30, 2025: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 176,393 | ​ | $ | (59,388) | ​ | $ | 291,912 | ​ | $ | (60,268) | ​ | $ | 468,305 | ​ | $ | (119,656)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | — | ​ | $ | — | ​ | $ | 13,607 | ​ | $ | (1,870) | ​ | $ | 13,607 | ​ | $ | (1,870)
Residential mortgage-backed and related securities | ​ |  | 4,560 | ​ |  | (51) | ​ |  | 33,832 | ​ |  | (3,886) | ​ |  | 38,392 | ​ |  | (3,937)
Municipal securities | ​ |  | 1,421 | ​ |  | (19) | ​ |  | 157,552 | ​ |  | (42,348) | ​ |  | 158,973 | ​ |  | (42,367)
Corporate securities | ​ |  | 480 | ​ |  | (1) | ​ |  | 24,679 | ​ |  | (1,171) | ​ |  | 25,159 | ​ |  | (1,172)
​ | ​ | $ | 6,461 | ​ | $ | (71) | ​ | $ | 229,670 | ​ | $ | (49,275) | ​ | $ | 236,131 | ​ | $ | (49,346)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | September 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 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended
​ | ​ | September 30, 2025 | ​ | September 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 |  | Nine Months Ended |
​ | ​ | ​ | ​ | ​ | September 30, 2025 | ​ | September 30, 2024 | ​ | September 30, 2025 | ​ | September 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 | ​ | $ | 484 | ​ | $ | 483
Due after one year through five years | ​ |  | 27,449 | ​ |  | 25,855
Due after five years | ​ |  | 926,445 | ​ |  | 828,706
​ | ​ | $ | 954,378 | ​ | $ | 855,044
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 380 | ​ | $ | 378
Due after one year through five years | ​ |  | 19,710 | ​ |  | 19,153
Due after five years | ​ |  | 234,500 | ​ |  | 189,792
​ | ​ | ​ | 254,590 | ​ | ​ | 209,323
Residential mortgage-backed and related securities | ​ | ​ | 60,800 | ​ | ​ | 57,108
Asset-backed securities | ​ |  | 4,822 | ​ |  | 4,918
​ | ​ | $ | 320,212 | ​ | $ | 271,349
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 250,094 | ​ | $ | 32,724
Corporate securities | ​ | ​ | 29,149 | ​ | ​ | 244,198
​ | ​ | $ | 279,243 | ​ | $ | 276,922
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 203,682 | ​ | $ | 161,355
Corporate securities | ​ |  | 33,721 | ​ |  | 32,648
​ | ​ | $ | 237,403 | ​ | $ | 194,003
Schedule of fair value of investment securities pledged |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 | ​ | December 31, 2024
​ | ​ | (dollars in thousands)
Derivatives: | ​ | ​ | ​ | ​ | ​ | ​
U.S. govt. sponsored agency securities | ​ | $ | 11,188 | ​ | $ | 6,222
Residential mortgage-backed and related securities | ​ | ​ | 24,078 | ​ | ​ | 18,132
Municipal securities | ​ |  | 143,057 | ​ |  | 151,107
​ | ​ | ​ | 178,323 | ​ | ​ | 175,461
Public deposits: | ​ | ​ | ​ | ​ | ​ | ​
U.S. govt. sponsored agency securities | ​ | ​ | 1,331 | ​ | ​ | 1,481
Residential mortgage-backed and related securities | ​ |  | 2,151 | ​ |  | 2,022
​ | ​ | ​ | 3,482 | ​ | ​ | 3,503
Short-term borrowings: | ​ | ​ | ​ | ​ | ​ | ​
U.S. govt. sponsored agency securities | ​ | ​ | — | ​ | ​ | 693
Residential mortgage-backed and related securities | ​ |  | — | ​ |  | 8,564
​ | ​ | ​ | — | ​ | ​ | 9,257
Other borrowings: | ​ | ​ | ​ | ​ | ​ | ​
Municipal securities* | ​ |  | 183,360 | ​ |  | —
​ | ​ | ​ | 183,360 | ​ | ​ | —
Total investments pledged: | ​ | ​ | ​ | ​ | ​ | ​
U.S. govt. sponsored agency securities | ​ | ​ | 12,519 | ​ | ​ | 8,396
Residential mortgage-backed and related securities | ​ | ​ | 26,229 | ​ | ​ | 28,718
Municipal securities | ​ |  | 326,417 | ​ |  | 151,107
​ | ​ | $ | 365,165 | ​ | $ | 188,221
​ | ​ | ​ | ​ | ​ | ​ | ​
* Municipal securities with an amortized cost of $200.3 million were pledged on secured borrowings as of September 30, 2025.

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