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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Amortized cost and fair value of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost* |  | Gains |  | (Losses) |  | Value |
​ | ​ | (dollars in thousands)
December 31, 2022: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 586,272 | ​ | $ | 5,292 | ​ | $ | (56,978) | ​ | $ | 534,586 | ​
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | 1,050 | ​
​ | ​ | $ | 587,322 | ​ | $ | 5,292 | ​ | $ | (56,978) | ​ | $ | 535,636 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. treasuries and 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ * HTM securities shown on the balance sheet of $587.1 million represent amortized cost of $587.3 million, net of allowance for credit losses of $180 thousand as of December 31, 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost* |  | Gains |  | (Losses) | ​ | Value
​ | ​ | (dollars in thousands)
December 31, 2021: |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ | ​
Municipal securities | ​ | $ | 471,533 | ​ | $ | 49,715 | ​ | $ | — | ​ | $ | 521,248
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | (1) | ​ |  | 1,049
​ | ​ | $ | 472,583 | ​ | $ | 49,715 | ​ | $ | (1) | ​ | $ | 522,297
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 23,370 | ​ | $ | 254 | ​ | $ | (296) | ​ | $ | 23,328
Residential mortgage-backed and related securities | ​ |  | 92,431 | ​ |  | 2,672 | ​ |  | (780) | ​ |  | 94,323
Municipal securities | ​ |  | 163,253 | ​ |  | 5,228 | ​ |  | (215) | ​ |  | 168,266
Asset-backed securities | ​ | ​ | 26,372 | ​ | ​ | 752 | ​ | ​ | — | ​ | ​ | 27,124
Other securities | ​ |  | 24,568 | ​ |  | 251 | ​ |  | (30) | ​ |  | 24,789
​ | ​ | $ | 329,994 | ​ | $ | 9,157 | ​ | $ | (1,321) | ​ | $ | 337,830
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* HTM securities shown on the balance sheet of $472.4 million represent amortized cost of $472.6 million, net of allowance for credit losses of $198 thousand as of December 31, 2021. ​
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)
December 31, 2022: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 347,651 | ​ | $ | (56,978) | ​ | $ | — | ​ | $ | — | ​ | $ | 347,651 | ​ | $ | (56,978)
​ | ​ | $ | 347,651 | ​ | $ | (56,978) | ​ | $ | — | ​ | $ | — | ​ | $ | 347,651 | ​ | $ | (56,978)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2021: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Other securities | ​ | $ | 1,049 | ​ | $ | (1) | ​ | $ | — | ​ | $ | — | ​ | $ | 1,049 | ​ | $ | (1)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. treasuries and govt. sponsored agency securities | ​ | $ | 9,802 | ​ | $ | (156) | ​ | $ | 3,035 | ​ | $ | (140) | ​ | $ | 12,837 | ​ | $ | (296)
Residential mortgage-backed and related securities | ​ |  | 5,363 | ​ |  | (67) | ​ |  | 19,406 | ​ |  | (713) | ​ |  | 24,769 | ​ |  | (780)
Municipal securities | ​ |  | 13,287 | ​ |  | (211) | ​ |  | 1,001 | ​ |  | (4) | ​ |  | 14,288 | ​ |  | (215)
Other securities | ​ | ​ | 4,528 | ​ | ​ | (30) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,528 | ​ | ​ | (30)
​ | ​ | $ | 32,980 | ​ | $ | (464) | ​ | $ | 23,442 | ​ | $ | (857) | ​ | $ | 56,422 | ​ | $ | (1,321)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Activity in allowance for credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022 | ​ | Year Ended December 31, 2021 | ​
​ | ​ | Municipal | ​ | Other | ​ | ​ | ​ | Municipal | ​ | Other | ​ | ​ | ​
​ |  | securities |  | securities |  | Total | ​ | securities |  | securities |  | Total | ​
​ |  | (dollars in thousands)
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 198 | ​ | $ | — | ​ | $ | 198 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
Impact of adopting ASU 2016-13 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 182 | ​ | ​ | 1 | ​ | ​ | 183 | ​
Provision for credit loss expense | ​ | ​ | (18) | ​ | ​ | — | ​ | ​ | (18) | ​ | ​ | 16 | ​ | ​ | (1) | ​ | ​ | 15 | ​
Balance, ending | ​ | $ | 180 | ​ | $ | — | ​ | $ | 180 | ​ | $ | 198 | ​ | $ | — | ​ | $ | 198 | ​
Realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | (dollars in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | ​ | $ | 111,375 | ​ | $ | 23,874 | ​ | $ | 38,562
Gross gains from sales of securities | ​ | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ |  | 2,553
Gross losses from sales of securities | ​ | ​ | ​ | ​ | ​ |  | — | ​ |  | (88) | ​ |  | (69)
​
Investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 2,902 | ​ | $ | 2,895
Due after one year through five years | ​ |  | 18,998 | ​ |  | 19,359
Due after five years | ​ |  | 565,422 | ​ |  | 513,382
​ | ​ | $ | 587,322 | ​ | $ | 535,636
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 4,522 | ​ | $ | 4,510
Due after one year through five years | ​ |  | 4,159 | ​ |  | 4,135
Due after five years | ​ |  | 299,507 | ​ |  | 247,372
​ | ​ | ​ | 308,188 | ​ | ​ | 256,017
Residential mortgage-backed and related securities | ​ | ​ | 73,438 | ​ | ​ | 66,215
Asset-backed securities | ​ |  | 18,885 | ​ |  | 18,728
​ | ​ | $ | 400,511 | ​ | $ | 340,960
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 330,576 | ​ | $ | 296,851
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 235,334 | ​ | ​ | 188,707
Other securities | ​ |  | 47,681 | ​ |  | 44,923
​ | ​ | $ | 283,015 | ​ | $ | 233,630
​

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