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Note 3 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 475,115 | ​ | $ | 45,360 | ​ | $ | (248) | ​ | $ | 520,227
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | 1,050
​ | ​ | $ | 476,165 | ​ | $ | 45,360 | ​ | $ | (248) | ​ | $ | 521,277
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 14,936 | ​ | $ | 447 | ​ | $ | (47) | ​ | $ | 15,336
Residential mortgage-backed and related securities | ​ |  | 127,670 | ​ |  | 5,510 | ​ |  | (338) | ​ |  | 132,842
Municipal securities | ​ |  | 147,241 | ​ |  | 5,215 | ​ |  | (48) | ​ |  | 152,408
Asset-backed securities | ​ | ​ | 39,663 | ​ | ​ | 1,111 | ​ | ​ | (91) | ​ | ​ | 40,683
Other securities | ​ |  | 20,550 | ​ |  | 147 | ​ |  | — | ​ |  | 20,697
​ | ​ | $ | 350,060 | ​ | $ | 12,430 | ​ | $ | (524) | ​ | $ | 361,966
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | (Losses) | ​ | Value
​ | ​ | (dollars in thousands)
December 31, 2019: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 399,596 | ​ | $ | 26,042 | ​ | $ | (143) | ​ | $ | 425,495
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | 1,050
​ | ​ | $ | 400,646 | ​ | $ | 26,042 | ​ | $ | (143) | ​ | $ | 426,545
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 19,872 | ​ | $ | 283 | ​ | $ | (77) | ​ | $ | 20,078
Residential mortgage-backed and related securities | ​ |  | 118,724 | ​ |  | 2,045 | ​ |  | (182) | ​ |  | 120,587
Municipal securities | ​ |  | 46,659 | ​ |  | 1,602 | ​ |  | (4) | ​ |  | 48,257
Asset-backed securities | ​ | ​ | 16,958 | ​ | ​ | — | ​ | ​ | (71) | ​ | ​ | 16,887
Other securities | ​ |  | 4,749 | ​ |  | 138 | ​ |  | (1) | ​ |  | 4,886
​ | ​ | $ | 206,962 | ​ | $ | 4,068 | ​ | $ | (335) | ​ | $ | 210,695
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, 2020: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 8,407 | ​ | $ | (248) | ​ | $ | — | ​ | $ | — | ​ | $ | 8,407 | ​ | $ | (248)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 3,199 | ​ | $ | (47) | ​ | $ | — | ​ | $ | — | ​ | $ | 3,199 | ​ | $ | (47)
Residential mortgage-backed and related securities | ​ |  | 37,549 | ​ |  | (338) | ​ |  | — | ​ |  | — | ​ |  | 37,549 | ​ |  | (338)
Municipal securities | ​ |  | 10,110 | ​ |  | (48) | ​ |  | — | ​ |  | — | ​ |  | 10,110 | ​ |  | (48)
Asset-backed securities | ​ | ​ | 6,884 | ​ | ​ | (52) | ​ | ​ | 9,945 | ​ | ​ | (39) | ​ | ​ | 16,829 | ​ | ​ | (91)
​ | ​ | $ | 57,742 | ​ | $ | (485) | ​ | $ | 9,945 | ​ | $ | (39) | ​ | $ | 67,687 | ​ | $ | (524)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2019: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 509 | ​ | $ | (1) | ​ | $ | 10,047 | ​ | $ | (142) | ​ | $ | 10,556 | ​ | $ | (143)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 1,431 | ​ | $ | (21) | ​ | $ | 2,117 | ​ | $ | (56) | ​ | $ | 3,548 | ​ | $ | (77)
Residential mortgage-backed and related securities | ​ |  | 2,263 | ​ |  | (17) | ​ |  | 17,862 | ​ |  | (165) | ​ |  | 20,125 | ​ |  | (182)
Municipal securities | ​ |  | — | ​ |  | — | ​ |  | 724 | ​ |  | (4) | ​ |  | 724 | ​ |  | (4)
Asset-backed securities | ​ | ​ | 16,886 | ​ | ​ | (71) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,886 | ​ | ​ | (71)
Other securities | ​ |  | 249 | ​ |  | (1) | ​ |  | — | ​ |  | — | ​ |  | 249 | ​ |  | (1)
​ | ​ | $ | 20,829 | ​ | $ | (110) | ​ | $ | 20,703 | ​ | $ | (225) | ​ | $ | 41,532 | ​ | $ | (335)
Realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | ​ | ​ | ​ | ​ | (dollars in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | ​ | $ | 38,562 | ​ | $ | 30,055 | ​ | $ | 1,938
Gross gains from sales of securities | ​ | ​ | ​ | ​ | ​ |  | 2,553 | ​ |  | 176 | ​ |  | —
Gross losses from sales of securities | ​ | ​ | ​ | ​ | ​ |  | (69) | ​ |  | (206) | ​ |  | —
Investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 3,417 | ​ | $ | 3,443
Due after one year through five years | ​ |  | 34,396 | ​ |  | 35,103
Due after five years | ​ |  | 438,352 | ​ |  | 482,731
​ | ​ | $ | 476,165 | ​ | $ | 521,277
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 2,369 | ​ | $ | 2,373
Due after one year through five years | ​ |  | 13,970 | ​ |  | 14,328
Due after five years | ​ |  | 166,388 | ​ |  | 171,740
​ | ​ | ​ | 182,727 | ​ | ​ | 188,441
Residential mortgage-backed and related securities | ​ | ​ | 127,670 | ​ | ​ | 132,842
Asset-backed securities | ​ |  | 39,663 | ​ |  | 40,683
​ | ​ | $ | 350,060 | ​ | $ | 361,966
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 227,773 | ​ | $ | 236,134
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 138,688 | ​ | ​ | 143,536
Other securities | ​ |  | 6,500 | ​ |  | 6,647
​ | ​ | $ | 145,188 | ​ | $ | 150,183

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