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Note 16 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities AFS | $ 1,547,128 | $ 1,604,570
Equity securities | 34,429 | 40,406
Foreign exchange contracts with gain | 62,794 | 124,452
Foreign exchange contracts with gain, fair value | 490 | 379
Interest rate swaps | 1,065,580 | 1,406,879
Interest rate swaps, fair value | 39,958 | 54,268
Foreign exchange contracts with loss | 171,945 | 101,378
Foreign exchange contracts with loss, fair value | 785 | 175
Interest rate swaps | 1,198,471 | 1,078,880
Interest rate swaps, fair value | 36,319 | 45,762
Commitments to extend credit | 3,470,296 | 3,808,620
Commitments to extend credit, fair value | (18,226) | (14,344)
Standby letters of credit | 439,769 | 368,618
Standby letters of credit, fair value | (2,900) | (2,821)
Other letters of credit | 12,347 | 11,308
Other letters of credit, fair value | (14) | (10)
Reported Value Measurement [Member] |  |
Cash and due from banks | 157,167 | 173,988
Short-term investments | 882,353 | 654,813
Securities AFS | 1,547,128 | 1,604,570
Loans, net | 19,203,649 | 19,382,858
Equity securities | 34,429 | 40,406
Investment in Federal Home Loan Bank stock | 17,250 | 17,746
Deposits | 19,686,199 | 19,325,447
Advances from Federal Home Loan Bank | 60,000 | 540,000
Other borrowings | 17,740 | 15,787
Long-term debt | 119,136 | 119,136
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 157,167 | 173,988
Short-term investments | 882,353 | 654,813
Securities AFS | 1,547,128 | 1,604,570
Loans, net | 19,500,647 | 19,605,152
Equity securities | 34,429 | 40,406
Investment in Federal Home Loan Bank stock | 17,250 | 17,746
Deposits | 19,670,327 | 19,347,070
Advances from Federal Home Loan Bank | 59,606 | 536,996
Other borrowings | 15,281 | 13,978
Long-term debt | $ 73,752 | $ 72,304

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- Definition Amount 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/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: 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 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: 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 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2009/role/commonPracticeRef -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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