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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Securities AFS $ 1,648,731 $ 1,604,570
Equity securities 31,488 40,406
Foreign exchange contracts with gain 192,452 124,452
Foreign exchange contracts with gain, fair value 226 379
Interest rate swaps 1,125,574 1,406,879
Interest rate swaps, fair value 52,192 54,268
Foreign exchange contracts with loss 116,939 101,378
Foreign exchange contracts with loss, fair value 241 175
Interest rate swaps 976,427 1,078,880
Interest rate swaps, fair value 39,962 45,762
Commitments to extend credit 3,919,636 3,808,620
Commitments to extend credit, fair value (19,634) (14,344)
Standby letters of credit 402,402 368,618
Standby letters of credit, fair value (3,051) (2,821)
Other letters of credit 16,755 11,308
Other letters of credit, fair value (12) (10)
Reported Value Measurement [Member]    
Cash and due from banks 160,389 173,988
Short-term investments 944,612 654,813
Securities AFS 1,648,731 1,604,570
Loans held for investment, net 19,193,335 19,382,858
Equity securities 31,488 40,406
Investment in Federal Home Loan Bank stock 17,250 17,746
Deposits 19,773,017 19,325,447
Advances from Federal Home Loan Bank 165,000 540,000
Other borrowings 17,838 15,787
Long-term debt 119,136 119,136
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 160,389 173,988
Short-term investments 944,612 654,813
Securities AFS 1,648,731 1,604,570
Loans held for investment, net 19,530,559 19,605,152
Equity securities 31,488 40,406
Investment in Federal Home Loan Bank stock 17,250 17,746
Deposits 19,775,767 19,347,070
Advances from Federal Home Loan Bank 164,997 536,996
Other borrowings 15,339 13,978
Long-term debt $ 74,294 $ 72,304