v3.26.1
Note 14 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Securities AFS $ 1,682,820 $ 1,658,223
Foreign exchange contracts with gain 196,989 176,037
Foreign exchange contracts with gain, fair value 459 211
Interest rate swaps 1,331,033 1,113,823
Interest rate swaps, fair value 20,814 26,472
Foreign exchange contracts with loss 15,818 37,991
Foreign exchange contracts with loss, fair value 190 73
Interest rate swaps 1,646,545 1,590,384
Interest rate swaps, fair value 18,873 28,917
Commitments to extend credit 4,115,612 3,809,999
Commitments to extend credit, fair value (23,080) (21,357)
Standby letters of credit 451,689 536,745
Standby letters of credit, fair value (2,441) (2,971)
Other letters of credit 16,527 4,442
Other letters of credit, fair value (14) (5)
Reported Value Measurement [Member]    
Cash and due from banks 163,976 146,320
Short-term investments 1,163,120 1,278,089
Securities AFS 1,682,820 1,658,223
Loans held for investment, net 20,387,830 19,936,388
Equity securities 80,854 51,886
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 21,061,648 20,894,167
Long-term debt 119,136 119,136
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 163,976 146,320
Short-term investments 1,163,120 1,278,089
Securities AFS 1,682,820 1,658,223
Loans held for investment, net 20,647,585 20,516,176
Equity securities 80,854 51,886
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits 21,029,316 20,884,386
Long-term debt $ 83,157 $ 79,818