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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale | $ 1,643,450 | $ 1,547,128
Equity securities | 32,111 | 34,429
Interest rate swaps | 29,162 | 39,958
Interest rate swaps | 31,815 | 36,319
Fair Value, Recurring [Member] |  |
Securities available-for-sale | 1,643,450 | 1,547,128
Equity securities | 30,572 | 32,890
Assets, fair value disclosure | 1,703,505 | 1,620,466
Liabilities, fair value disclosure | 32,000 | 37,104
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 29,162 | 39,958
Interest rate swaps | 31,815 | 36,319
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 321 | 490
Foreign exchange contracts | 185 | 785
Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 5,686 | 5,532
Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 10,278 | 7,287
Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 14,608 | 20,071
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 776,833 | 621,462
Equity securities | 30,572 | 32,890
Assets, fair value disclosure | 807,405 | 654,352
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 0 | 0
Interest rate swaps | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 0 | 0
Foreign exchange contracts | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 5,686 | 5,532
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 10,278 | 7,287
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 14,608 | 20,071
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 866,617 | 925,666
Equity securities | 0 | 0
Assets, fair value disclosure | 896,100 | 966,114
Liabilities, fair value disclosure | 32,000 | 37,104
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 29,162 | 39,958
Interest rate swaps | 31,815 | 36,319
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 321 | 490
Foreign exchange contracts | 185 | 785
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 0 | 0
Interest rate swaps | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 0 | 0
Foreign exchange contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
US Treasury Securities [Member] |  |
Securities available-for-sale | 776,833 | 621,462
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 776,833 | 621,462
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 776,833 | 621,462
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 6,860 | 9,149
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 6,860 | 9,149
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 6,860 | 9,149
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 25,005 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 25,005 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 25,005 |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 645,575 | 684,016
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 645,575 | 684,016
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 23,302 | 24,556
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 23,302 | 24,556
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 23,302 | 24,556
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 165,875 | 207,945
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 165,875 | 207,945
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 165,875 | 207,945
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | $ 0 | $ 0

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