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Note 3 - Investment Securities (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 33,690 | $ 0 | $ 0
Debt Securities, Available-for-Sale, Realized Gain | 1,100 |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0 |
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense | $ 0 | $ 0 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 182 | 192 |
Debt Securities, Available-for-Sale | $ 1,547,128 | $ 1,604,570 |
Equity Securities, FV-NI, Current | 34,429 | 40,406 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | (7,516) | 18,248 | 291
Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment | 0 | 0 | 553
Equity Securities, FV-NI, Realized Gain (Loss) |  |  | $ (101)
Asset Pledged as Collateral [Member] | Public Deposits and Other Borrowings [Member] |  |  |
Debt Securities, Available-for-Sale | $ 17,800 | $ 134,200 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 154 | 154 |
Debt Securities, Available-for-Sale | $ 684,016 | $ 786,723 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 16 | 24 |
Debt Securities, Available-for-Sale | $ 207,945 | $ 246,334 |
US Government Corporations and Agencies Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 9 | 8 |
Debt Securities, Available-for-Sale | $ 9,149 | $ 48,169 |
Collateralized Mortgage Obligations [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 3 | 5 |
Debt Securities, Available-for-Sale | $ 24,556 | $ 28,044 |
US Treasury Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 1 |
Debt Securities, Available-for-Sale | $ 621,462 | $ 495,300 |

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