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Note 3 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | 8,884 |  |  | $ | - |  |  | $ | (1,001 | ) |  | $ | 7,883 |
U.S. treasury securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 149,410 |  |  |  | - |  |  |  | (25,946 | ) |  |  | 123,464 |
Municipal securities |  |  | 278,813 |  |  |  | 60 |  |  |  | (40,203 | ) |  |  | 238,670 |
Collateralized debt obligations |  |  | 2,170 |  |  |  | - |  |  |  | (813 | ) |  |  | 1,357 |
Total securities available-for-sale |  | $ | 439,277 |  |  | $ | 60 |  |  | $ | (67,963 | ) |  | $ | 371,374 |
|  | (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 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | (Dollars in thousands) |
|  | Available-for-sale |
|  |  |  |  |  | Estimated |
|  | Cost |  |  | Fair |
December 31, 2023 |  | Basis |  |  | Value |
Due in one year or less |  | $ | 250 |  |  | $ | 249 |
Due from one to five years |  |  | 10,433 |  |  |  | 9,325 |
Due from five to ten years |  |  | 21,801 |  |  |  | 20,486 |
Due over ten years |  |  | 257,383 |  |  |  | 217,850 |
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | 149,410 |  |  |  | 123,464 |
Total |  | $ | 439,277 |  |  | $ | 371,374 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | (Dollars in thousands) |
|  | December 31, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Proceeds |  | $ | 476 |  |  | $ | 53,953 |
Gross gains |  |  | - |  |  |  | 733 |
Gross losses |  |  | (48 | ) |  |  | (71 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | (Dollars in thousands) |
|  | Unrealized gain/(loss) |
Ending balance, December 31, 2022 |  | $ | (64,300 | )
Current period change |  |  | 12,687 |
Ending balance, December 31, 2023 |  | $ | (51,613 | )
|  | (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, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entities |  | $ | - |  |  | $ | - |  |  | $ | 7,883 |  |  | $ | (1,001 | ) |  | $ | 7,883 |  |  | $ | (1,001 | ) |  |  | 100.0 | %
Collateralized mortgage obligations and residential mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | 123,464 |  |  |  | (25,946 | ) |  |  | 123,464 |  |  |  | (25,946 | ) |  |  | 100.0 | %
Municipal securities |  |  | - |  |  |  | - |  |  |  | 229,595 |  |  |  | (40,203 | ) |  |  | 229,595 |  |  |  | (40,203 | ) |  |  | 96.2 | %
Collateralized debt obligations |  |  | - |  |  |  | - |  |  |  | 1,357 |  |  |  | (813 | ) |  |  | 1,357 |  |  |  | (813 | ) |  |  | 100.0 | %
Total temporarily impaired |  | $ | - |  |  | $ | - |  |  | $ | 362,299 |  |  | $ | (67,963 | ) |  | $ | 362,299 |  |  | $ | (67,963 | ) |  |  | 97.6 | %
Number of securities |  |  |  |  |  |  | - |  |  |  |  |  |  |  | 434 |  |  |  |  |  |  |  | 434 |  |  |  |  |
|  | (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 |  |  |  |  |

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