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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale | $ 1,434,040 | $ 1,547,128
Equity securities | 30,238 | 34,429
Interest rate swaps | 32,468 | 39,958
Interest rate swaps | 33,565 | 36,319
Fair Value, Recurring [Member] |  |
Equity securities | 28,699 | 32,890
Assets, fair value disclosure | 1,495,785 | 1,620,466
Liabilities, fair value disclosure | 33,889 | 37,104
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 32,468 | 39,958
Interest rate swaps | 33,565 | 36,319
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 578 | 490
Foreign exchange contracts | 324 | 785
Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 5,615 | 5,532
Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 7,245 | 7,287
Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 15,839 | 20,071
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Equity securities | 28,699 | 32,890
Assets, fair value disclosure | 570,343 | 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 | 5,615 | 5,532
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 7,245 | 7,287
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 15,839 | 20,071
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Equity securities | 0 | 0
Assets, fair value disclosure | 925,442 | 966,114
Liabilities, fair value disclosure | 33,889 | 37,104
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 32,468 | 39,958
Interest rate swaps | 33,565 | 36,319
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 578 | 490
Foreign exchange contracts | 324 | 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] |  |
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 | 541,644 | 621,462
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 541,644 | 621,462
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 541,644 | 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 | 8,723 | 9,149
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 8,723 | 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 | 8,723 | 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
Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 679,675 | 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 | 679,675 | 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 | 24,663 | 24,556
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 24,663 | 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 | 24,663 | 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 | 179,335 | 207,945
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 179,335 | 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 | 179,335 | 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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