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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
June 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 453,512,000 |  |  | $ | 0 |  |  | $ | (46,177,000 | ) |  | $ | 407,335,000 |
Mortgage-backed securities |  |  | 40,676,000 |  |  |  | 56,000 |  |  |  | (4,368,000 | ) |  |  | 36,364,000 |
Municipal general obligation bonds |  |  | 145,002,000 |  |  |  | 190,000 |  |  |  | (7,519,000 | ) |  |  | 137,673,000 |
Municipal revenue bonds |  |  | 24,287,000 |  |  |  | 18,000 |  |  |  | (2,539,000 | ) |  |  | 21,766,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 663,977,000 |  |  | $ | 264,000 |  |  | $ | (60,603,000 | ) |  | $ | 603,638,000 |
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 Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
June 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 176,893,000 |  |  | $ | 17,028,000 |  |  | $ | 230,442,000 |  |  | $ | 29,149,000 |  |  | $ | 407,335,000 |  |  | $ | 46,177,000 |
Mortgage-backed securities |  |  | 23,935,000 |  |  |  | 2,259,000 |  |  |  | 11,372,000 |  |  |  | 2,109,000 |  |  |  | 35,307,000 |  |  |  | 4,368,000 |
Municipal general obligation bonds |  |  | 90,305,000 |  |  |  | 5,551,000 |  |  |  | 16,284,000 |  |  |  | 1,968,000 |  |  |  | 106,589,000 |  |  |  | 7,519,000 |
Municipal revenue bonds |  |  | 12,823,000 |  |  |  | 1,454,000 |  |  |  | 7,088,000 |  |  |  | 1,085,000 |  |  |  | 19,911,000 |  |  |  | 2,539,000 |
|  | $ | 303,956,000 |  |  | $ | 26,292,000 |  |  | $ | 265,186,000 |  |  | $ | 34,311,000 |  |  | $ | 569,142,000 |  |  | $ | 60,603,000 |
|  | 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 Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2022 |  |  | 1.35 | % |  | $ | 3,750,000 |  |  | $ | 3,738,000 |
Due in 2023 through 2027 |  |  | 1.14 |  |  |  | 266,931,000 |  |  |  | 250,890,000 |
Due in 2028 through 2032 |  |  | 1.84 |  |  |  | 311,780,000 |  |  |  | 277,595,000 |
Due in 2033 and beyond |  |  | 2.33 |  |  |  | 40,340,000 |  |  |  | 34,551,000 |
Mortgage-backed securities |  |  | 2.04 |  |  |  | 40,676,000 |  |  |  | 36,364,000 |
Other investments |  |  | 3.88 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 1.60 | % |  | $ | 663,977,000 |  |  | $ | 603,638,000 |

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