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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

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