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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale |  | $ 1,508,798 | $ 1,473,348
Equity securities |  | 31,456 | 22,158
Warrants |  | 83,434 | 90,451
Foreign exchange contracts with gain |  | 220,784 | 72,996
Foreign exchange contracts with gain, fair value |  | 858 | 448
Interest rate swaps |  | 1,502,403 | 817,615
Interest rate swaps, fair value |  | 83,434 | 44,443
Foreign exchange contracts with loss |  | 64,971 | 170,213
Foreign exchange contracts with loss, fair value |  | 939 | 942
Interest rate swaps |  | 642,054 | 595,426
Interest rate swaps, fair value |  | 56,058 | 51,864
Commitments to extend credit |  | 3,989,855 | 3,630,304
Commitments to extend credit, fair value |  | (15,038) | (14,797)
Standby letters of credit |  | 329,789 | 315,821
Standby letters of credit, fair value |  | (2,308) | (2,738)
Other letters of credit |  | 10,214 | 29,416
Other letters of credit, fair value |  | (10) | (33)
Reported Value Measurement [Member] |  |  |
Cash and due from banks |  | 145,580 | 195,440
Short-term investments |  | 1,017,354 | 966,962
Securities available-for-sale |  | 1,508,798 | 1,473,348
Loans, net |  | 18,859,682 | 18,100,898
Equity securities |  | 31,456 | 22,158
Investment in Federal Home Loan Bank stock |  | 17,250 | 17,250
Deposits |  | 19,635,588 | 18,505,279
Advances from Federal Home Loan Bank |  | 15,000 | 485,000
Other borrowings |  | 22,374 | 22,600
Long-term debt |  | 119,136 | 119,136
Reported Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | 42 | 50
Estimate of Fair Value Measurement [Member] |  |  |
Cash and due from banks |  | 145,580 | 195,440
Short-term investments |  | 1,017,354 | 966,962
Securities available-for-sale |  | 1,508,798 | 1,473,348
Loans, net | [1] | 18,838,004 | 17,944,588
Equity securities |  | 31,456 | 22,158
Investment in Federal Home Loan Bank stock |  | 17,250 | 17,250
Deposits |  | 19,746,224 | 18,572,387
Advances from Federal Home Loan Bank |  | 14,186 | 482,737
Other borrowings |  | 18,282 | 18,385
Long-term debt |  | 68,536 | 68,231
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | $ 42 | $ 50
[1] | In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit price notion.

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