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Note 8 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Nov. 23, 2014 | Mar. 13, 2014 | Nov. 23, 2004 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Securities Sold under Agreements to Repurchase, Total |  |  |  |  | $ 0 |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 150,000 | $ 670,000 |
Threshold for Deferred Bonus |  |  |  | $ 225,000 |  |  |
Amount of Deferred Bonus Accrued in Other Liabilities |  |  | $ 300 | $ 610 |  |  |
Accrued Interest on Deferred Bonus | 5.72% | 5.06% | 5.02% | 7.00% |  |  |
Interest Expense, Other |  |  |  |  | 105 | 99 | $ 92
Accrued Bonuses |  |  |  |  | 2,100 | 2,000 |
Junior Subordinated Notes, Noncurrent |  |  |  |  | $ 119,100 | $ 119,100 |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  | 30 years |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 2.40% | 4.09% |
Interest Expense, Debt, Total |  |  |  |  | $ 3,600 | $ 5,600 | $ 5,200
Mature in May 2021 [Member] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 5,000 |  |
Mature in June 2021 [Member] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 50,000 |  |
Mature in July 2021 [Member] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 75,000 |  |
Mature in May 2023 [Member] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 20,000 |  |
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] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | 0 | $ 450,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  | 1.66% |
Non Overnight Borrowings [Member] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  | $ 150,000 | $ 220,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  | 2.15% | 2.26% |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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