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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%

X

- 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

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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.

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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

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-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

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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
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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