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Note 9 - Long-term Debt (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Nov. 30, 2018 | Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument, Face Amount |  |  | $ 105 | $ 105
Six Point Five Percent Fixed To Floating Rate Subordinated Debentures Due March Thirty First Two Thousand Twenty Six Member |  |  |  |
Debt Instrument, Face Amount | $ 50 |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.16% |  |  |
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual | $ 35 |  |  |
Six Point Five Percent Fixed To Floating Rate Subordinated Debentures Due March Thirty First Two Thousand Twenty Six Member | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 6.50% |  |  |
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] |  |  |  |
Debt Instrument, Face Amount |  | $ 55 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 6.18% |  |
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual |  | $ 25 |  |
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.15% |  |

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- Definition Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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