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Note 2 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(Dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 442,496 |  |  | $ | 0 |  |  | $ | (52,000 | ) |  | $ | 390,496 |
Mortgage-backed securities |  |  | 35,168 |  |  |  | 20 |  |  |  | (5,715 | ) |  |  | 29,473 |
Municipal general obligation bonds |  |  | 172,126 |  |  |  | 1,924 |  |  |  | (6,190 | ) |  |  | 167,860 |
Municipal revenue bonds |  |  | 30,708 |  |  |  | 262 |  |  |  | (2,207 | ) |  |  | 28,763 |
Other investments |  |  | 500 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500 |
|  | $ | 680,998 |  |  | $ | 2,206 |  |  | $ | (66,112 | ) |  | $ | 617,092 |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 453,836 |  |  | $ | 0 |  |  | $ | (65,092 | ) |  | $ | 388,744 |
Mortgage-backed securities |  |  | 38,002 |  |  |  | 19 |  |  |  | (6,068 | ) |  |  | 31,953 |
Municipal general obligation bonds |  |  | 163,041 |  |  |  | 450 |  |  |  | (9,058 | ) |  |  | 154,433 |
Municipal revenue bonds |  |  | 30,267 |  |  |  | 102 |  |  |  | (3,063 | ) |  |  | 27,306 |
Other investments |  |  | 500 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500 |
|  | $ | 685,646 |  |  | $ | 571 |  |  | $ | (83,281 | ) |  | $ | 602,936 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
(Dollars in thousands) |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
Description of Securities |  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 0 |  |  | $ | 0 |  |  | $ | 390,496 |  |  | $ | 52,000 |  |  | $ | 390,496 |  |  | $ | 52,000 |
Mortgage-backed securities |  |  | 114 |  |  |  | 0 |  |  |  | 28,749 |  |  |  | 5,715 |  |  |  | 28,863 |  |  |  | 5,715 |
Municipal general obligation bonds |  |  | 1,109 |  |  |  | 6 |  |  |  | 106,171 |  |  |  | 6,184 |  |  |  | 107,280 |  |  |  | 6,190 |
Municipal revenue bonds |  |  | 1,506 |  |  |  | 8 |  |  |  | 20,602 |  |  |  | 2,199 |  |  |  | 22,108 |  |  |  | 2,207 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 2,729 |  |  | $ | 14 |  |  | $ | 546,018 |  |  | $ | 66,098 |  |  | $ | 548,747 |  |  | $ | 66,112 |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 53,019 |  |  | $ | 5,713 |  |  | $ | 335,725 |  |  | $ | 59,379 |  |  | $ | 388,744 |  |  | $ | 65,092 |
Mortgage-backed securities |  |  | 31,127 |  |  |  | 6,068 |  |  |  | 12 |  |  |  | 0 |  |  |  | 31,139 |  |  |  | 6,068 |
Municipal general obligation bonds |  |  | 97,252 |  |  |  | 4,516 |  |  |  | 32,870 |  |  |  | 4,542 |  |  |  | 130,122 |  |  |  | 9,058 |
Municipal revenue bonds |  |  | 12,532 |  |  |  | 1,141 |  |  |  | 10,609 |  |  |  | 1,922 |  |  |  | 23,141 |  |  |  | 3,063 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 193,930 |  |  | $ | 17,438 |  |  | $ | 379,216 |  |  | $ | 65,843 |  |  | $ | 573,146 |  |  | $ | 83,281 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Fair |
(Dollars in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 57,724 |  |  | $ | 56,289 |
Due from one to five years |  |  | 261,591 |  |  |  | 241,758 |
Due from five to ten years |  |  | 279,722 |  |  |  | 243,791 |
Due after ten years |  |  | 46,293 |  |  |  | 45,281 |
Mortgage-backed securities |  |  | 35,168 |  |  |  | 29,473 |
Other investments |  |  | 500 |  |  |  | 500 |
|  | $ | 680,998 |  |  | $ | 617,092 |

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