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Note 9 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Nov. 23, 2014 | Mar. 13, 2014 | Nov. 23, 2004 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Securities Sold under Agreements to Repurchase |  |  |  |  | $ 0 | $ 0 | $ 0
Advance from Federal Home Loan Bank |  |  |  |  | 60,000 | 540,000 |
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds |  |  |  |  | 7,470 |  |
Debt Securities, Available-for-Sale |  |  |  |  | 1,547,128 | 1,604,570 |
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 |  |  |  |  | 2,600 | 2,400 |
Interest Expense, Other |  |  |  |  | $ 129 | 122 | 116
Junior Subordinated Notes, Noncurrent |  |  |  |  |  | $ 119,100 |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  | 30 years |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 7.75% | 7.54% |
Interest Expense, Debt |  |  |  |  | $ 8,100 | $ 6,500 | $ 5,500
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 |  |  |  |  |  |
Mature in September 2024 [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | 60,000 |  |
Federal Home Loan Bank Securities [Member] | Asset Not Pledged as Collateral [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |  | 1,530 |  |
Over-night Borrowings [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | 0 | 0 |
Non Overnight Borrowings [Member] |  |  |  |  |  |  |
Advance from Federal Home Loan Bank |  |  |  |  | $ 60,000 | $ 540,000 |
Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate |  |  |  |  | 5.08% | 5.64% |

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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/1943274/2147478878/942-470-45-1 + Details
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