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Note 3 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | (Dollars in thousands) |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Cost |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Basis |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 8,883 |  |  | $ | - |  |  | $ | (1,258 | ) |  |  | 7,625 |
U.S. treasury securities |  |  | 389 |  |  |  | - |  |  |  | - |  |  |  | 389 |
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 163,000 |  |  |  | - |  |  |  | (28,884 | ) |  |  | 134,116 |
Municipal securities |  |  | 281,032 |  |  |  | 7 |  |  |  | (53,321 | ) |  |  | 227,718 |
Collateralized debt obligations |  |  | 2,173 |  |  |  | - |  |  |  | (1,125 | ) |  |  | 1,048 |
Total securities available-for-sale |  | $ | 455,477 |  |  | $ | 7 |  |  | $ | (84,588 | ) |  | $ | 370,896 |
|  | (Dollars in thousands) |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Cost |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Basis |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 8,883 |  |  | $ | - |  |  | $ | (214 | ) |  | $ | 8,669 |
U.S. treasury securities |  |  | 400 |  |  |  | - |  |  |  | - |  |  |  | 400 |
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 187,279 |  |  |  | 961 |  |  |  | (3,539 | ) |  |  | 184,701 |
Municipal securities |  |  | 322,750 |  |  |  | 9,904 |  |  |  | (527 | ) |  |  | 332,127 |
Collateralized debt obligations |  |  | 2,173 |  |  |  | - |  |  |  | (1,181 | ) |  |  | 992 |
Total securities available-for-sale |  | $ | 521,485 |  |  | $ | 10,865 |  |  | $ | (5,461 | ) |  | $ | 526,889 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | (Dollars in thousands) |
|  | Available-for-sale |
|  |  |  |  |  | Estimated |
|  | Cost |  |  | Fair |
December 31, 2022 |  | Basis |  |  | Value |
Due in one year or less |  | $ | 105 |  |  | $ | 105 |
Due from one to five years |  |  | 4,868 |  |  |  | 4,493 |
Due from five to ten years |  |  | 21,099 |  |  |  | 18,993 |
Due over ten years |  |  | 266,405 |  |  |  | 213,189 |
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 163,000 |  |  |  | 134,116 |
Total |  | $ | 455,477 |  |  | $ | 370,896 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | (Dollars in thousands) |
|  | December 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Proceeds |  | $ | 53,953 |  |  | $ | 43,756 |
Gross gains |  |  | 733 |  |  |  | 2,010 |
Gross losses |  |  | (71 | ) |  |  | (23 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | (Dollars in thousands) |
|  | Unrealized |
|  | gain/(loss) |
Ending balance, December 31, 2020 |  | $ | 10,441 |
Current period change |  |  | (6,165 | )
Ending balance, December 31, 2021 |  | $ | 4,276 |
|  | (Dollars in thousands) |
|  | Unrealized gain/(loss) |
Ending balance, December 31, 2021 |  | $ | 4,276 |
Current period change |  |  | (68,576 | )
Ending balance, December 31, 2022 |  | $ | (64,300 | )
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | (Dollars in thousands) |  |  |  |  |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |  |  |  |  |
|  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Percentage of |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Total Portfolio |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | in Loss Position |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | - |  |  | $ | - |  |  | $ | 7,625 |  |  | $ | (1,258 | ) |  | $ | 7,625 |  |  | $ | (1,258 | ) |  |  | 100.0 | %
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 32,700 |  |  |  | (4,955 | ) |  |  | 101,416 |  |  |  | (23,929 | ) |  |  | 134,116 |  |  |  | (28,884 | ) |  |  | 100.0 | %
Municipal securities |  |  | 171,581 |  |  |  | (35,935 | ) |  |  | 52,961 |  |  |  | (17,386 | ) |  |  | 224,542 |  |  |  | (53,321 | ) |  |  | 98.6 | %
Collateralized debt obligations |  |  | - |  |  |  | - |  |  |  | 1,048 |  |  |  | (1,125 | ) |  |  | 1,048 |  |  |  | (1,125 | ) |  |  | 100.0 | %
Total temporarily impaired |  | $ | 204,281 |  |  | $ | (40,890 | ) |  | $ | 163,050 |  |  | $ | (43,698 | ) |  | $ | 367,331 |  |  | $ | (84,588 | ) |  |  | 99.0 | %
Number of securities |  |  |  |  |  |  | 311 |  |  |  |  |  |  |  | 135 |  |  |  |  |  |  |  | 446 |  |  |  |  |
|  | (Dollars in thousands) |  |  |  |  |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |  |  |  |  |
|  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Percentage of |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Total Portfolio |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | in Loss Position |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 8,669 |  |  | $ | (214 | ) |  | $ | - |  |  | $ | - |  |  | $ | 8,669 |  |  | $ | (214 | ) |  |  | 100.0 | %
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 126,373 |  |  |  | (3,175 | ) |  |  | 8,109 |  |  |  | (364 | ) |  |  | 134,482 |  |  |  | (3,539 | ) |  |  | 72.8 | %
Municipal securities |  |  | 70,309 |  |  |  | (527 | ) |  |  | - |  |  |  | - |  |  |  | 70,309 |  |  |  | (527 | ) |  |  | 21.2 | %
Collateralized debt obligations |  |  | - |  |  |  | - |  |  |  | 992 |  |  |  | (1,181 | ) |  |  | 992 |  |  |  | (1,181 | ) |  |  | 100.0 | %
Total temporarily impaired |  | $ | 205,351 |  |  | $ | (3,916 | ) |  | $ | 9,101 |  |  | $ | (1,545 | ) |  | $ | 214,452 |  |  | $ | (5,461 | ) |  |  | 40.7 | %
Number of securities |  |  |  |  |  |  | 133 |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  | 138 |  |  |  |  |

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