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Note 10 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Nov. 23, 2014 | Mar. 13, 2014 | Nov. 23, 2004 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Securities Sold under Agreements to Repurchase |  |  |  |  | $ 0 | $ 0 | $ 0
Advance from Federal Home Loan Bank |  |  |  |  | 540,000 | 485,000 |
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds |  |  |  |  | 6,600,000 |  |
Debt Securities, Available-for-Sale |  |  |  |  | 1,604,570 | 1,473,348 |
Threshold for Deferred Bonus |  |  |  | $ 225 |  |  |
Amount of Deferred Bonus Accrued in Other Liabilities |  |  | $ 300 | $ 610 |  |  |
Accrued Interest on Deferred Bonus | 5.72% | 5.06% | 5.02% | 7.00% |  |  |
Accrued Bonuses |  |  |  |  | 2,400 | 2,300 |
Interest Expense, Other |  |  |  |  | 122 | $ 116 | 110
Junior Subordinated Notes, Noncurrent |  |  |  |  | $ 119,100 |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  | 30 years |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 7.54% | 4.01% |
Interest Expense, Debt |  |  |  |  | $ 6,500 | $ 5,500 | $ 5,800
Federal Home Loan Bank Securities [Member] | Asset Not Pledged as Collateral [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |  | 1,470,000 |  |
Mature in January 2024 [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | 525,000 |  |
Mature in September 2024 [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | 15,000 |  |
Ten-year Treasury Note [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.75% |  |  |  |  |
Debt Instrument, Term (Year) |  | 10 years |  |  |  |  |
Five-year Treasury Note [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.50% |  |  |  |  |  |
Debt Instrument, Term (Year) | 5 years |  |  |  |  |  |
Over-night Borrowings [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | 0 | $ 150,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  | 4.65% |
Non Overnight Borrowings [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | $ 540,000 | $ 335,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  | 5.64% | 4.54% |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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