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Note 2 - INVESTMENT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Amortized cost and fair value of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost* |  | Gains |  | (Losses) |  | Value |
​ | ​ | (dollars in thousands)
March 31, 2021: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 452,076 | ​ | $ | 38,312 | ​ | $ | (91) | ​ | $ | 490,297 | ​
Other securities | ​ |  | 1,050 | ​ |  | — | ​ |  | — | ​ |  | 1,050 | ​
​ | ​ | $ | 453,126 | ​ | $ | 38,312 | ​ | $ | (91) | ​ | $ | 491,347 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. govt. sponsored agency securities | ​ | $ | 14,494 | ​ | $ | 352 | ​ | $ | (265) | ​ | $ | 14,581 | ​
Residential mortgage-backed and related securities | ​ |  | 115,230 | ​ |  | 3,742 | ​ |  | (920) | ​ |  | 118,052 | ​
Municipal securities | ​ |  | 160,703 | ​ |  | 3,492 | ​ |  | (1,622) | ​ |  | 162,573 | ​
Asset-backed securities | ​ | ​ | 38,620 | ​ | ​ | 1,197 | ​ | ​ | (2) | ​ | ​ | 39,815 | ​
Other securities | ​ |  | 11,679 | ​ |  | 173 | ​ |  | — | ​ |  | 11,852 | ​
​ | ​ | $ | 340,726 | ​ | $ | 8,956 | ​ | $ | (2,809) | ​ | $ | 346,873 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
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)
March 31, 2021: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | — | ​ | $ | — | ​ | $ | 8,019 | ​ | $ | (91) | ​ | $ | 8,019 | ​ | $ | (91)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | 2,963 | ​ | $ | (265) | ​ | $ | — | ​ | $ | — | ​ | $ | 2,963 | ​ | $ | (265)
Residential mortgage-backed and related securities | ​ |  | 35,721 | ​ |  | (919) | ​ |  | 157 | ​ |  | (1) | ​ |  | 35,878 | ​ |  | (920)
Municipal securities | ​ |  | 68,407 | ​ |  | (1,622) | ​ |  | — | ​ |  | — | ​ |  | 68,407 | ​ |  | (1,622)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,998 | ​ | ​ | (2) | ​ | ​ | 1,998 | ​ | ​ | (2)
​ | ​ | $ | 107,091 | ​ | $ | (2,806) | ​ | $ | 2,155 | ​ | $ | (3) | ​ | $ | 109,246 | ​ | $ | (2,809)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
Activity in allowance for credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended March 31, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Municipal securities |  | Other securities |  | Total
​ |  | ​ | (dollars in thousands)
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | —
Impact of adopting ASU 2016-13 | ​ | ​ | ​ | ​ | 182 | ​ | ​ | 1 | ​ | ​ | 183
Provision for credit loss expense | ​ | ​ | ​ | ​ | (9) | ​ | ​ | — | ​ | ​ | (9)
Balance, ending | ​ | ​ | ​ | $ | 173 | ​ | $ | 1 | ​ | $ | 174
Investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 3,592 | ​ | $ | 3,611
Due after one year through five years | ​ |  | 32,784 | ​ |  | 33,424
Due after five years | ​ |  | 416,750 | ​ |  | 454,312
​ | ​ | $ | 453,126 | ​ | $ | 491,347
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 2,152 | ​ | $ | 2,182
Due after one year through five years | ​ |  | 12,888 | ​ |  | 13,175
Due after five years | ​ |  | 171,836 | ​ |  | 173,649
​ | ​ | ​ | 186,876 | ​ | ​ | 189,006
Residential mortgage-backed and related securities | ​ | ​ | 115,230 | ​ | ​ | 118,052
Asset-backed securities | ​ |  | 38,620 | ​ |  | 39,815
​ | ​ | $ | 340,726 | ​ | $ | 346,873
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 246,515 | ​ | $ | 255,969
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 154,432 | ​ | ​ | 156,016
Other securities | ​ |  | 11,679 | ​ |  | 11,852
​ | ​ | $ | 166,111 | ​ | $ | 167,868
​ | ​ | ​ | ​ | ​ | ​ | ​

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