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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale | $ 1,648,433 | $ 1,547,128
Equity securities | 28,849 | 34,429
Interest rate swaps | 31,571 | 39,958
Interest rate swaps | 34,108 | 36,319
Fair Value, Recurring [Member] |  |
Securities available-for-sale | 1,648,433 | 1,547,128
Equity securities | 27,310 | 32,890
Assets, fair value disclosure | 1,708,836 | 1,620,466
Liabilities, fair value disclosure | 34,355 | 37,104
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 31,571 | 39,958
Interest rate swaps | 34,108 | 36,319
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 1,522 | 490
Foreign exchange contracts | 247 | 785
Fair Value, Recurring [Member] | Mutual Funds [Member] |  |
Equity securities | 5,633 | 5,532
Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 9,012 | 7,287
Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 12,665 | 20,071
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 768,249 | 621,462
Equity securities | 27,310 | 32,890
Assets, fair value disclosure | 795,559 | 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 | 5,633 | 5,532
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 9,012 | 7,287
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Equity Securities [Member] |  |
Equity securities | 12,665 | 20,071
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 880,184 | 925,666
Equity securities | 0 | 0
Assets, fair value disclosure | 913,277 | 966,114
Liabilities, fair value disclosure | 34,355 | 37,104
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest rate swaps | 31,571 | 39,958
Interest rate swaps | 34,108 | 36,319
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Foreign exchange contracts | 1,522 | 490
Foreign exchange contracts | 247 | 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 | 768,249 | 621,462
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 768,249 | 621,462
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 768,249 | 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 | 7,934 | 9,149
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 7,934 | 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 | 7,934 | 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 | 658,431 | 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 | 658,431 | 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 | 23,927 | 24,556
Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 23,927 | 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 | 23,927 | 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 | 189,892 | 207,945
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Securities available-for-sale | 189,892 | 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 | 189,892 | 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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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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