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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale |  | $ 1,487,321 | $ 1,473,348
Equity securities |  | 37,674 | 22,158
Warrants |  | 81,760 | 90,451
Fair Value, Inputs, Level 1 [Member] |  |  |
Debt Securities, Available-for-Sale |  | 272,038 | 240,500
Equity securities |  | 37,674 | 22,158
Fair Value, Inputs, Level 2 [Member] |  |  |
Debt Securities, Available-for-Sale |  | 1,215,283 | 1,232,848
Equity securities |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Equity securities |  | 0 | 0
Estimate of Fair Value Measurement [Member] |  |  |
Cash and due from banks |  | 187,886 | 195,440
Short-term investments |  | 1,294,379 | 966,962
Debt Securities, Available-for-Sale |  | 1,487,321 | 1,473,348
Loans, net | [1] | 18,647,234 | 17,944,588
Equity securities |  | 37,674 | 22,158
Investment in Federal Home Loan Bank stock |  | 25,242 | 17,250
Deposits |  | 19,216,932 | 18,572,387
Advances from Federal Home Loan Bank |  | 811,425 | 482,737
Other borrowings |  | 18,177 | 18,385
Long-term debt |  | 66,685 | 68,231
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | 0 | 50
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and due from banks |  | 187,886 | 195,440
Short-term investments |  | 1,294,379 | 966,962
Debt Securities, Available-for-Sale |  | 272,038 | 240,500
Loans, net | [1] | 0 | 0
Equity securities |  | 37,674 | 22,158
Investment in Federal Home Loan Bank stock |  | 0 | 0
Deposits |  | 0 | 0
Advances from Federal Home Loan Bank |  | 0 | 0
Other borrowings |  | 0 | 0
Long-term debt |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Warrants [Member] |  |  |
Warrants |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and due from banks |  | 0 | 0
Short-term investments |  | 0 | 0
Debt Securities, Available-for-Sale |  | 1,215,283 | 1,232,848
Loans, net | [1] | 0 | 0
Equity securities |  | 0 | 0
Investment in Federal Home Loan Bank stock |  | 25,242 | 17,250
Deposits |  | 0 | 0
Advances from Federal Home Loan Bank |  | 811,425 | 482,737
Other borrowings |  | 0 | 0
Long-term debt |  | 66,685 | 68,231
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Warrants [Member] |  |  |
Warrants |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and due from banks |  | 0 | 0
Short-term investments |  | 0 | 0
Debt Securities, Available-for-Sale |  | 0 | 0
Loans, net | [1] | 18,647,234 | 17,944,588
Equity securities |  | 0 | 0
Investment in Federal Home Loan Bank stock |  | 0 | 0
Deposits |  | 19,216,932 | 18,572,387
Advances from Federal Home Loan Bank |  | 0 | 0
Other borrowings |  | 18,177 | 18,385
Long-term debt |  | $ 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |
Warrants |  |  | $ 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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