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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