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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, 2025
Dec. 31, 2024
Securities AFS $ 1,648,433 $ 1,547,128
Equity securities 28,849 34,429
Foreign exchange contracts with gain 197,362 62,794
Foreign exchange contracts with gain, fair value 1,522 490
Interest rate swaps 1,081,046 1,065,580
Interest rate swaps, fair value 31,571 39,958
Foreign exchange contracts with loss 37,944 171,945
Foreign exchange contracts with loss, fair value 247 785
Interest rate swaps 1,492,313 1,198,471
Interest rate swaps, fair value 34,108 36,319
Commitments to extend credit 3,564,709 3,470,296
Commitments to extend credit, fair value (19,138) (18,226)
Standby letters of credit 466,558 439,769
Standby letters of credit, fair value (2,763) (2,900)
Other letters of credit 11,327 12,347
Other letters of credit, fair value (13) (14)
Reported Value Measurement [Member]    
Cash and due from banks 190,011 157,167
Short-term investments 1,056,964 882,353
Securities AFS 1,648,433 1,547,128
Loans held-for-sale 13,338 0
Loans held for investment, net 19,597,337 19,203,649
Equity securities 28,849 34,429
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 20,006,330 19,686,199
Advances from Federal Home Loan Bank 412,000 60,000
Other borrowings 17,652 17,740
Long-term debt 119,136 119,136
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 190,011 157,167
Short-term investments 1,056,964 882,353
Securities AFS 1,648,433 1,547,128
Loans held-for-sale 13,338 0
Loans held for investment, net 20,072,336 19,500,647
Equity securities 28,849 34,429
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 19,983,108 19,670,327
Advances from Federal Home Loan Bank 410,444 59,606
Other borrowings 15,656 15,281
Long-term debt $ 76,785 $ 73,752