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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Securities AFS | $ 1,434,040 | $ 1,547,128
Equity securities | 30,238 | 34,429
Foreign exchange contracts with gain | 155,622 | 62,794
Foreign exchange contracts with gain, fair value | 578 | 490
Interest rate swaps | 1,021,825 | 1,065,580
Interest rate swaps, fair value | 32,468 | 39,958
Foreign exchange contracts with loss | 87,174 | 171,945
Foreign exchange contracts with loss, fair value | 324 | 785
Interest rate swaps | 1,241,528 | 1,198,471
Interest rate swaps, fair value | 33,565 | 36,319
Commitments to extend credit | 3,576,752 | 3,470,296
Commitments to extend credit, fair value | (20,113) | (18,226)
Standby letters of credit | 444,189 | 439,769
Standby letters of credit, fair value | (2,702) | (2,900)
Other letters of credit | 10,645 | 12,347
Other letters of credit, fair value | (12) | (14)
Reported Value Measurement [Member] |  |
Cash and due from banks | 175,027 | 157,167
Short-term investments | 1,209,487 | 882,353
Securities AFS | 1,434,040 | 1,547,128
Loans held-for-sale | 11,759 | 0
Loans held for investment, net | 19,167,410 | 19,203,649
Equity securities | 30,238 | 34,429
Investment in Federal Home Loan Bank stock | 17,250 | 17,250
Deposits | 19,817,528 | 19,686,199
Advances from Federal Home Loan Bank | 95,000 | 60,000
Other borrowings | 17,696 | 17,740
Long-term debt | 119,136 | 119,136
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 175,027 | 157,167
Short-term investments | 1,209,487 | 882,353
Securities AFS | 1,434,040 | 1,547,128
Loans held-for-sale | 11,759 | 0
Loans held for investment, net | 19,563,984 | 19,500,647
Equity securities | 30,238 | 34,429
Investment in Federal Home Loan Bank stock | 17,250 | 17,250
Deposits | 19,795,020 | 19,670,327
Advances from Federal Home Loan Bank | 94,645 | 59,606
Other borrowings | 15,446 | 15,281
Long-term debt | $ 74,944 | $ 73,752

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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/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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