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Note 2 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 442,500,000 |  |  | $ | 74,000 |  |  | $ | (31,996,000 | ) |  | $ | 410,578,000 |
Mortgage-backed securities |  |  | 40,215,000 |  |  |  | 123,000 |  |  |  | (2,592,000 | ) |  |  | 37,746,000 |
Municipal general obligation bonds |  |  | 138,916,000 |  |  |  | 540,000 |  |  |  | (4,785,000 | ) |  |  | 134,671,000 |
Municipal revenue bonds |  |  | 23,900,000 |  |  |  | 39,000 |  |  |  | (1,773,000 | ) |  |  | 22,166,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 646,031,000 |  |  | $ | 776,000 |  |  | $ | (41,146,000 | ) |  | $ | 605,661,000 |
December 31, 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 |
|  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 190,990,000 |  |  | $ | 11,971,000 |  |  | $ | 215,783,000 |  |  | $ | 20,025,000 |  |  | $ | 406,773,000 |  |  | $ | 31,996,000 |
Mortgage-backed securities |  |  | 26,110,000 |  |  |  | 1,783,000 |  |  |  | 6,594,000 |  |  |  | 809,000 |  |  |  | 32,704,000 |  |  |  | 2,592,000 |
Municipal general obligation bonds |  |  | 63,139,000 |  |  |  | 3,399,000 |  |  |  | 12,600,000 |  |  |  | 1,386,000 |  |  |  | 75,739,000 |  |  |  | 4,785,000 |
Municipal revenue bonds |  |  | 13,671,000 |  |  |  | 999,000 |  |  |  | 5,842,000 |  |  |  | 774,000 |  |  |  | 19,513,000 |  |  |  | 1,773,000 |
|  | $ | 293,910,000 |  |  | $ | 18,152,000 |  |  | $ | 240,819,000 |  |  | $ | 22,994,000 |  |  | $ | 534,729,000 |  |  | $ | 41,146,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 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 |
|  | $ | 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 |  |  |  |  |  |  |  |  |
|  | Average |  |  | Amortized |  |  | Fair |
|  | Yield (%) |  |  | Cost |  |  | Value |
Due in 2022 |  |  | 1.98 |  |  | $ | 10,171,000 |  |  | $ | 10,171,000 |
Due in 2023 through 2027 |  |  | 1.11 |  |  |  | 263,429,000 |  |  |  | 251,105,000 |
Due in 2028 through 2032 |  |  | 1.74 |  |  |  | 295,377,000 |  |  |  | 273,366,000 |
Due in 2033 and beyond |  |  | 2.13 |  |  |  | 36,339,000 |  |  |  | 32,773,000 |
Mortgage-backed securities |  |  | 1.95 |  |  |  | 40,215,000 |  |  |  | 37,746,000 |
Other investments |  |  | 3.75 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 1.52 |  |  | $ | 646,031,000 |  |  | $ | 605,661,000 |

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