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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Total contracts		0	1	12	5
Pre-modification recorded investment		$ 0	$ 33	$ 5,207	$ 742
Post-modification recorded investment	[1]	$ 0	$ 29	$ 5,191	$ 727
Below Market Interest Rate [Member]
Total contracts				1
Pre-modification recorded investment				$ 50
Post-modification recorded investment	[1]			$ 50
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts			0	1
Pre-modification recorded investment			$ 0	$ 50
Post-modification recorded investment	[1]		$ 0	$ 50
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts			0		4
Pre-modification recorded investment			$ 0		$ 709
Post-modification recorded investment	[1]		$ 0		$ 698
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		0		1	2
Pre-modification recorded investment		$ 0		$ 529	$ 221
Post-modification recorded investment	[1]	$ 0		$ 529	$ 218
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts			0		2
Pre-modification recorded investment			$ 0		$ 488
Post-modification recorded investment	[1]		$ 0		$ 480
Payment Deferral [Member]
Total contracts		0		11	1
Pre-modification recorded investment		$ 0		$ 5,157	$ 33
Post-modification recorded investment	[1]	$ 0		$ 5,141	$ 29
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts				3	1
Pre-modification recorded investment				$ 742	$ 33
Post-modification recorded investment	[1]			$ 726	$ 29
Payment Deferral [Member] | Commercial and Industrial [Member]
Total contracts		0		3
Pre-modification recorded investment		$ 0		$ 1,708
Post-modification recorded investment	[1]	$ 0		$ 1,708
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts		0		3
Pre-modification recorded investment		$ 0		$ 2,115
Post-modification recorded investment	[1]	$ 0		$ 2,115
Payment Deferral [Member] | Construction, Development and Other Land [Member]
Total contracts				1
Pre-modification recorded investment				$ 63
Post-modification recorded investment	[1]			$ 63
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts					0
Pre-modification recorded investment					$ 0
Post-modification recorded investment	[1]				$ 0
[1] Represents the loan balance immediately following modification

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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X

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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