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Note 7 - Investment Securities (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 4,300 |  | $ 4,300 |  | $ 4,600
Equity Securities, FV-NI, Unrealized Gain (Loss) | (1,400) | $ (1,400) | (5,581) | $ (10,457) |
Equity Securities, FV-NI, Decrease in Unrealized Loss |  |  | (4,900) |  |
Equity Securities, FV-NI, Current | $ 28,849 |  | $ 28,849 |  | $ 34,429
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 183 |  | 183 |  | 182
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | $ 0 |  | $ 0 |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) |  |  | 0 |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 1,648,433 |  | 1,648,433 |  | $ 1,547,128
Asset Pledged as Collateral [Member] | Public Deposits and Other Borrowings [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 17,700 |  | $ 17,700 |  | $ 17,800
Collateralized Mortgage-Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 147 |  | 147 |  | 154
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 658,431 |  | $ 658,431 |  | $ 684,016
Corporate Debt Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 14 |  | 14 |  | 16
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 189,892 |  | $ 189,892 |  | $ 207,945
US Treasury Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 11 |  | 11 |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 768,249 |  | $ 768,249 |  | $ 621,462
US Government Corporations and Agencies Securities [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 8 |  | 8 |  | 9
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 7,934 |  | $ 7,934 |  | $ 9,149
Collateralized Mortgage Obligations [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 3 |  | 3 |  | 3
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 23,927 |  | $ 23,927 |  | $ 24,556

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