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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