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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Securities AFS $ 1,643,450 $ 1,547,128
Equity securities 32,111 34,429
Foreign exchange contracts with gain 114,395 62,794
Foreign exchange contracts with gain, fair value 321 490
Interest rate swaps 1,064,539 1,065,580
Interest rate swaps, fair value 29,162 39,958
Foreign exchange contracts with loss 122,381 171,945
Foreign exchange contracts with loss, fair value 185 785
Interest rate swaps 1,542,988 1,198,471
Interest rate swaps, fair value 31,815 36,319
Commitments to extend credit 3,670,598 3,470,296
Commitments to extend credit, fair value (18,620) (18,226)
Standby letters of credit 510,886 439,769
Standby letters of credit, fair value (3,225) (2,900)
Other letters of credit 6,452 12,347
Other letters of credit, fair value (7) (14)
Reported Value Measurement [Member]    
Cash and due from banks 166,167 157,167
Short-term investments 1,141,886 882,353
Securities AFS 1,643,450 1,547,128
Loans held for investment, net 19,903,082 19,203,649
Equity securities 32,111 34,429
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 20,521,149 19,686,199
Advances from Federal Home Loan Bank 190,000 60,000
Other borrowings 17,628 17,740
Long-term debt 119,136 119,136
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 166,167 157,167
Short-term investments 1,141,886 882,353
Securities AFS 1,643,450 1,547,128
Loans held for investment, net 20,447,466 19,500,647
Equity securities 32,111 34,429
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 20,506,029 19,670,327
Advances from Federal Home Loan Bank 189,312 59,606
Other borrowings 15,338 15,281
Long-term debt $ 78,627 $ 73,752