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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, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Securities available-for-sale | $ 1,653,167 | $ 1,604,570 |
Equity securities | 31,380 | 40,406 | $ 40,400
Derivative asset | 55,138 | 54,268 |
Assets, fair value disclosure | 1,740,019 | 1,699,623 |
Derivative liability | 42,014 | 45,762 |
Liabilities, fair value disclosure | 42,200 | 45,937 |
Interest Rate Swap [Member] |  |  |
Derivative asset | 55,138 | 54,268 |
Derivative liability | 42,014 | 45,762 |
Foreign Exchange Contract [Member] |  |  |
Derivative asset | 334 | 379 |
Derivative liability | 186 | 175 |
Mutual Funds [Member] |  |  |
Equity securities | 5,526 | 5,585 |
Preferred Stock of Government Sponsored Entities [Member] |  |  |
Equity securities | 2,384 | 1,821 |
Other Equity Securities [Member] |  |  |
Equity securities | 23,470 | 33,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 541,798 | 495,300 |
Equity securities | 31,380 | 40,406 |
Assets, fair value disclosure | 573,178 | 535,706 |
Liabilities, fair value disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |  |
Derivative asset | 0 | 0 |
Derivative liability | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative asset | 0 | 0 |
Derivative liability | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |  |
Equity securities | 5,526 | 5,585 |
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |  |
Equity securities | 2,384 | 1,821 |
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |  |
Equity securities | 23,470 | 33,000 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 1,111,369 | 1,109,270 |
Equity securities | 0 | 0 |
Assets, fair value disclosure | 1,166,841 | 1,163,917 |
Liabilities, fair value disclosure | 42,200 | 45,937 |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Derivative asset | 55,138 | 54,268 |
Derivative liability | 42,014 | 45,762 |
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative asset | 334 | 379 |
Derivative liability | 186 | 175 |
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |  |
Equity securities | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |  |
Equity securities | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |  |
Equity securities | 0 | 0 |
Fair Value, Inputs, Level 3 [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] | Interest Rate Swap [Member] |  |  |
Derivative asset | 0 | 0 |
Derivative liability | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative asset | 0 | 0 |
Derivative liability | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |  |  |
Equity securities | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |  |
Equity securities | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Other Equity Securities [Member] |  |  |
Equity securities | 0 | 0 |
US Treasury Securities [Member] |  |  |
Securities available-for-sale | 541,798 | 495,300 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 541,798 | 495,300 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
US Government Corporations and Agencies Securities [Member] |  |  |
Securities available-for-sale | 12,058 | 48,169 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 12,058 | 48,169 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities available-for-sale | 59,745 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 0 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 59,745 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | 0 |  |
Commercial Mortgage-Backed Securities [Member] |  |  |
Securities available-for-sale | 754,162 | 786,723 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 754,162 | 786,723 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
Collateralized Mortgage Obligations [Member] |  |  |
Securities available-for-sale | 27,198 | 28,044 |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 27,198 | 28,044 |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
Corporate Debt Securities [Member] |  |  |
Securities available-for-sale | 258,206 | 246,334 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale | 0 | 0 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale | 258,206 | 246,334 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available-for-sale | $ 0 | $ 0 |

X
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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