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Note 2 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 453,836,000 |  |  | $ | 0 |  |  | $ | (65,092,000 | ) |  | $ | 388,744,000 |
Mortgage-backed securities |  |  | 38,002,000 |  |  |  | 19,000 |  |  |  | (6,068,000 | ) |  |  | 31,953,000 |
Municipal general obligation bonds |  |  | 163,041,000 |  |  |  | 450,000 |  |  |  | (9,058,000 | ) |  |  | 154,433,000 |
Municipal revenue bonds |  |  | 30,267,000 |  |  |  | 102,000 |  |  |  | (3,063,000 | ) |  |  | 27,306,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 685,646,000 |  |  | $ | 571,000 |  |  | $ | (83,281,000 | ) |  | $ | 602,936,000 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 398,874,000 |  |  | $ | 266,000 |  |  | $ | (8,769,000 | ) |  | $ | 390,371,000 |
Mortgage-backed securities |  |  | 41,906,000 |  |  |  | 549,000 |  |  |  | (652,000 | ) |  |  | 41,803,000 |
Municipal general obligation bonds |  |  | 133,894,000 |  |  |  | 4,092,000 |  |  |  | (392,000 | ) |  |  | 137,594,000 |
Municipal revenue bonds |  |  | 22,289,000 |  |  |  | 331,000 |  |  |  | (145,000 | ) |  |  | 22,475,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 597,463,000 |  |  | $ | 5,238,000 |  |  | $ | (9,958,000 | ) |  | $ | 592,743,000 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
Description of Securities |  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 53,019,000 |  |  | $ | 5,713,000 |  |  | $ | 335,725,000 |  |  | $ | 59,379,000 |  |  | $ | 388,744,000 |  |  | $ | 65,092,000 |
Mortgage-backed securities |  |  | 31,127,000 |  |  |  | 6,068,000 |  |  |  | 12,000 |  |  |  | 0 |  |  |  | 31,139,000 |  |  |  | 6,068,000 |
Municipal general obligation bonds |  |  | 97,252,000 |  |  |  | 4,516,000 |  |  |  | 32,870,000 |  |  |  | 4,542,000 |  |  |  | 130,122,000 |  |  |  | 9,058,000 |
Municipal revenue bonds |  |  | 12,532,000 |  |  |  | 1,141,000 |  |  |  | 10,609,000 |  |  |  | 1,922,000 |  |  |  | 23,141,000 |  |  |  | 3,063,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 193,930,000 |  |  | $ | 17,438,000 |  |  | $ | 379,216,000 |  |  | $ | 65,843,000 |  |  | $ | 573,146,000 |  |  | $ | 83,281,000 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 274,287,000 |  |  | $ | 5,274,000 |  |  | $ | 110,053,000 |  |  | $ | 3,495,000 |  |  | $ | 384,340,000 |  |  | $ | 8,769,000 |
Mortgage-backed securities |  |  | 23,184,000 |  |  |  | 652,000 |  |  |  | 24,000 |  |  |  | 0 |  |  |  | 23,208,000 |  |  |  | 652,000 |
Municipal general obligation bonds |  |  | 40,748,000 |  |  |  | 392,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 40,748,000 |  |  |  | 392,000 |
Municipal revenue bonds |  |  | 12,843,000 |  |  |  | 137,000 |  |  |  | 414,000 |  |  |  | 8,000 |  |  |  | 13,257,000 |  |  |  | 145,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 351,062,000 |  |  | $ | 6,455,000 |  |  | $ | 110,491,000 |  |  | $ | 3,503,000 |  |  | $ | 461,553,000 |  |  | $ | 9,958,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted |  |  | Amortized |  |  | Fair |
|  | Average Yield |  |  | Cost |  |  | Value |
Due in one year or less |  |  | 0.76% |  |  | $ | 21,278,000 |  |  | $ | 20,732,000 |
Due from one to five years |  |  | 1.22 |  |  |  | 249,262,000 |  |  |  | 227,357,000 |
Due from five to ten years |  |  | 1.88 |  |  |  | 318,700,000 |  |  |  | 271,652,000 |
Due after ten years |  |  | 3.03 |  |  |  | 57,904,000 |  |  |  | 50,742,000 |
Mortgage-backed securities |  |  | 2.10 |  |  |  | 38,002,000 |  |  |  | 31,953,000 |
Other investments |  |  | 4.94 |  |  |  | 500,000 |  |  |  | 500,000 |
|  |  | 1.72% |  |  | $ | 685,646,000 |  |  | $ | 602,936,000 |

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