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Note 2 - INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 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) | ​
September 30, 2023: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 614,245 | ​ | $ | (180) | ​ | $ | 2,448 | ​ | $ | (92,718) | ​ | $ | 523,795 | ​
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | (26) | ​ |  | 1,024 | ​
​ | ​ | $ | 615,295 | ​ | $ | (180) | ​ | $ | 2,448 | ​ | $ | (92,744) | ​ | $ | 524,819 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 19,130 | ​ | $ | — | ​ | $ | 13 | ​ | $ | (3,141) | ​ | $ | 16,002 | ​
Residential mortgage-backed and related securities | ​ |  | 66,433 | ​ |  | — | ​ |  | — | ​ |  | (8,487) | ​ |  | 57,946 | ​
Municipal securities | ​ |  | 207,318 | ​ |  | — | ​ |  | — | ​ |  | (57,546) | ​ |  | 149,772 | ​
Asset-backed securities | ​ | ​ | 16,226 | ​ | ​ | — | ​ | ​ | 144 | ​ | ​ | (44) | ​ | ​ | 16,326 | ​
Other securities | ​ |  | 46,531 | ​ |  | (989) | ​ |  | 2 | ​ |  | (4,311) | ​ |  | 41,233 | ​
​ | ​ | $ | 355,638 | ​ | $ | (989) | ​ | $ | 159 | ​ | $ | (73,529) | ​ | $ | 281,279 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
September 30, 2023: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 235,313 | ​ | $ | (20,751) | ​ | $ | 237,690 | ​ | $ | (71,967) | ​ | $ | 473,003 | ​ | $ | (92,718)
Other securities | ​ | ​ | 523 | ​ | ​ | (26) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 523 | ​ | ​ | (26)
​ | ​ | $ | 235,836 | ​ | $ | (20,777) | ​ | $ | 237,690 | ​ | $ | (71,967) | ​ | $ | 473,526 | ​ | $ | (92,744)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 1,649 | ​ | $ | (1) | ​ | $ | 13,377 | ​ | $ | (3,140) | ​ | $ | 15,026 | ​ | $ | (3,141)
Residential mortgage-backed and related securities | ​ |  | 77 | ​ |  | (1) | ​ |  | 57,869 | ​ |  | (8,486) | ​ |  | 57,946 | ​ |  | (8,487)
Municipal securities | ​ |  | 1,067 | ​ |  | (38) | ​ |  | 148,159 | ​ |  | (57,508) | ​ |  | 149,226 | ​ |  | (57,546)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,521 | ​ | ​ | (44) | ​ | ​ | 10,521 | ​ | ​ | (44)
Other securities | ​ |  | 3,823 | ​ |  | (427) | ​ |  | 34,190 | ​ |  | (3,884) | ​ |  | 38,013 | ​ |  | (4,311)
​ | ​ | $ | 6,616 | ​ | $ | (467) | ​ | $ | 264,116 | ​ | $ | (73,062) | ​ | $ | 270,732 | ​ | $ | (73,529)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | Nine Months Ended | ​ | ​
​ | ​ | September 30, 2023 | ​ | September 30, 2022 | ​ | September 30, 2023 | ​ | September 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Nine Months Ended |
​ | ​ | ​ | ​ | ​ | September 30, 2023 | ​ | September 30, 2022 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | $ | 30,568 | ​ | $ | 111,375 | ​
Gross gains from sales of securities | ​ | ​ | ​ | ​ |  | 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 | ​ | $ | 1,907 | ​ | $ | 1,882
Due after one year through five years | ​ |  | 27,159 | ​ |  | 27,700
Due after five years | ​ |  | 586,229 | ​ |  | 495,237
​ | ​ | $ | 615,295 | ​ | $ | 524,819
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 3,160 | ​ | $ | 3,146
Due after one year through five years | ​ |  | 14,338 | ​ |  | 12,239
Due after five years | ​ |  | 255,481 | ​ |  | 191,622
​ | ​ | ​ | 272,979 | ​ | ​ | 207,007
Residential mortgage-backed and related securities | ​ | ​ | 66,433 | ​ | ​ | 57,946
Asset-backed securities | ​ |  | 16,226 | ​ |  | 16,326
​ | ​ | $ | 355,638 | ​ | $ | 281,279
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 230,493 | ​ | $ | 194,222
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 205,747 | ​ | ​ | 148,235
Other securities | ​ |  | 45,577 | ​ |  | 40,277
​ | ​ | $ | 251,324 | ​ | $ | 188,512

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