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Note 2 - INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Amortized cost and fair value of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance |  | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit |  | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost |  | (Losses) |  | Gains |  | (Losses) |  | Value |
​ | ​ | (dollars in thousands) | ​
June 30, 2023: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 575,698 | ​ | $ | (180) | ​ | $ | 11,351 | ​ | $ | (49,054) | ​ | $ | 537,815 | ​
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | (21) | ​ |  | 1,029 | ​
​ | ​ | $ | 576,748 | ​ | $ | (180) | ​ | $ | 11,351 | ​ | $ | (49,075) | ​ | $ | 538,844 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 21,602 | ​ | $ | — | ​ | $ | 14 | ​ | $ | (2,674) | ​ | $ | 18,942 | ​
Residential mortgage-backed and related securities | ​ |  | 68,025 | ​ |  | — | ​ |  | — | ​ |  | (7,068) | ​ |  | 60,957 | ​
Municipal securities | ​ |  | 208,038 | ​ |  | — | ​ |  | 1 | ​ |  | (40,129) | ​ |  | 167,910 | ​
Asset-backed securities | ​ | ​ | 17,363 | ​ | ​ | — | ​ | ​ | 126 | ​ | ​ | (96) | ​ | ​ | 17,393 | ​
Other securities | ​ |  | 46,579 | ​ |  | (989) | ​ |  | 6 | ​ |  | (4,478) | ​ |  | 41,118 | ​
​ | ​ | $ | 361,607 | ​ | $ | (989) | ​ | $ | 147 | ​ | $ | (54,445) | ​ | $ | 306,320 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost | ​ | (Losses) | ​ | Gains |  | (Losses) | ​ | Value | ​
​ | ​ | (dollars in thousands) | ​
December 31, 2022: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Municipal securities | ​ | $ | 586,272 | ​ | $ | (180) | ​ | $ | 5,292 | ​ | $ | (56,798) | ​ | $ | 534,586 | ​
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1,050 | ​
​ | ​ | $ | 587,322 | ​ | $ | (180) | ​ | $ | 5,292 | ​ | $ | (56,798) | ​ | $ | 535,636 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. govt. sponsored agency securities | ​ | $ | 19,745 | ​ | $ | — | ​ | $ | 19 | ​ | $ | (2,783) | ​ | $ | 16,981 | ​
Residential mortgage-backed and related securities | ​ |  | 73,438 | ​ |  | — | ​ |  | — | ​ |  | (7,223) | ​ |  | 66,215 | ​
Municipal securities | ​ |  | 239,812 | ​ |  | — | ​ |  | 66 | ​ |  | (46,700) | ​ |  | 193,178 | ​
Asset-backed securities | ​ | ​ | 18,885 | ​ | ​ | — | ​ | ​ | 48 | ​ | ​ | (205) | ​ | ​ | 18,728 | ​
Other securities | ​ |  | 48,631 | ​ |  | — | ​ |  | 27 | ​ |  | (2,800) | ​ |  | 45,858 | ​
​ | ​ | $ | 400,511 | ​ | $ | — | ​ | $ | 160 | ​ | $ | (59,711) | ​ | $ | 340,960 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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, 2023: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 219,789 | ​ | $ | (29,758) | ​ | $ | 136,224 | ​ | $ | (19,296) | ​ | $ | 356,013 | ​ | $ | (49,054)
Other securities | ​ | ​ | 529 | ​ | ​ | (21) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 529 | ​ | ​ | (21)
​ | ​ | $ | 220,318 | ​ | $ | (29,779) | ​ | $ | 136,224 | ​ | $ | (19,296) | ​ | $ | 356,542 | ​ | $ | (49,075)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 3,866 | ​ | $ | (5) | ​ | $ | 14,056 | ​ | $ | (2,669) | ​ | $ | 17,922 | ​ | $ | (2,674)
Residential mortgage-backed and related securities | ​ |  | 4,377 | ​ |  | (212) | ​ |  | 56,581 | ​ |  | (6,856) | ​ |  | 60,958 | ​ |  | (7,068)
Municipal securities | ​ |  | 1,910 | ​ |  | (59) | ​ |  | 164,631 | ​ |  | (40,070) | ​ |  | 166,541 | ​ |  | (40,129)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,848 | ​ | ​ | (96) | ​ | ​ | 10,848 | ​ | ​ | (96)
Other securities | ​ |  | 7,854 | ​ |  | (590) | ​ |  | 28,019 | ​ |  | (3,888) | ​ |  | 35,873 | ​ |  | (4,478)
​ | ​ | $ | 18,007 | ​ | $ | (866) | ​ | $ | 274,135 | ​ | $ | (53,579) | ​ | $ | 292,142 | ​ | $ | (54,445)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2022: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 347,651 | ​ | $ | (56,798) | ​ | $ | — | ​ | $ | — | ​ | $ | 347,651 | ​ | $ | (56,798)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 5,138 | ​ | $ | (326) | ​ | $ | 10,591 | ​ | $ | (2,457) | ​ | $ | 15,729 | ​ | $ | (2,783)
Residential mortgage-backed and related securities | ​ |  | 48,469 | ​ |  | (3,327) | ​ |  | 17,690 | ​ |  | (3,896) | ​ |  | 66,159 | ​ |  | (7,223)
Municipal securities | ​ |  | 178,172 | ​ |  | (42,661) | ​ |  | 9,809 | ​ |  | (4,039) | ​ |  | 187,981 | ​ |  | (46,700)
Asset-backed securities | ​ | ​ | 13,684 | ​ | ​ | (205) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 13,684 | ​ | ​ | (205)
Other securities | ​ | ​ | 35,206 | ​ | ​ | (2,404) | ​ | ​ | 4,122 | ​ | ​ | (396) | ​ | ​ | 39,328 | ​ | ​ | (2,800)
​ | ​ | $ | 280,669 | ​ | $ | (48,923) | ​ | $ | 42,212 | ​ | $ | (10,788) | ​ | $ | 322,881 | ​ | $ | (59,711)
Activity in allowance for credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​ | ​
​ | ​ | June 30, 2023 | ​ | June 30, 2022 | ​ | June 30, 2023 | ​ | June 30, 2022 | ​ | ​
​ | ​ | Securities HTM | ​ | Securities AFS | ​ | Securities HTM | ​ | Securities HTM | ​ | ​ | Securities AFS | ​ | Securities HTM | ​ | ​
​ | ​ | Municipal | ​ | Corporate | ​ | Municipal | ​ | Municipal | ​ | ​ | Corporate | ​ | Municipal | ​ | ​
​ |  | securities |  | securities | ​ | securities | ​ | securities | ​ | ​ | securities | ​ | securities | ​ | ​
​ |  | (dollars in thousands)
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 180 | ​ | $ | 989 | ​ | $ | 198 | ​ | $ | 180 | ​ | $ | — | ​ | $ | 198 | ​ | ​
Provision for credit loss expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 989 | ​ | ​ | — | ​ | ​
Balance, ending | ​ | $ | 180 | ​ | $ | 989 | ​ | $ | 198 | ​ | $ | 180 | ​ | $ | 989 | ​ | $ | 198 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Three Months Ended |  | Six Months Ended |
​ | ​ | ​ | ​ | ​ | June 30, 2023 | ​ | June 30, 2022 | ​ | June 30, 2023 | ​ | June 30, 2022 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | $ | 1,940 | ​ | $ | 111,375 | ​ | $ | 30,568 | ​ | $ | 111,375 | ​
Gross gains from sales of securities | ​ | ​ | ​ | ​ |  | 12 | ​ |  | — | ​ |  | 56 | ​ |  | — | ​
Gross losses from sales of securities | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ |  | (507) | ​ |  | — | ​
Investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 2,845 | ​ | $ | 2,813
Due after one year through five years | ​ |  | 26,584 | ​ |  | 28,126
Due after five years | ​ |  | 547,319 | ​ |  | 507,905
​ | ​ | $ | 576,748 | ​ | $ | 538,844
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 5,376 | ​ | $ | 5,362
Due after one year through five years | ​ |  | 8,607 | ​ |  | 8,275
Due after five years | ​ |  | 262,236 | ​ |  | 214,333
​ | ​ | ​ | 276,219 | ​ | ​ | 227,970
Residential mortgage-backed and related securities | ​ | ​ | 68,025 | ​ | ​ | 60,957
Asset-backed securities | ​ |  | 17,363 | ​ |  | 17,393
​ | ​ | $ | 361,607 | ​ | $ | 306,320
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 210,513 | ​ | $ | 192,465
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 206,213 | ​ | ​ | 166,107
Other securities | ​ |  | 45,626 | ​ |  | 40,158
​ | ​ | $ | 251,839 | ​ | $ | 206,265

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