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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Total contracts		0	4	1	11
Pre-modification recorded investment		$ 0	$ 2,714	$ 1,390	$ 5,207
Post-modification recorded investment	[1]	0	2,698	$ 1,374	$ 5,191
Below Market Interest Rate [Member]
Total contracts				0	1
Pre-modification recorded investment				$ 0	$ 50
Post-modification recorded investment				$ 0	$ 50
Below Market Interest Rate [Member] | Single Family Non-owner Occupied [Member]
Total contracts				0	1
Pre-modification recorded investment				$ 0	$ 50
Post-modification recorded investment				$ 0	$ 50
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Pre-modification recorded investment		0	0
Post-modification recorded investment	[1]	$ 0	$ 0
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts		0	0	0	0
Pre-modification recorded investment		$ 0	$ 0	$ 0	$ 0
Post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	0	0	0
Pre-modification recorded investment		$ 0	$ 0	$ 0	$ 0
Post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 0
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		0	0	0	0
Pre-modification recorded investment				$ 0	$ 0
Post-modification recorded investment	[1]			$ 0	$ 0
Payment Deferral [Member]
Total contracts		0	4	1	10
Pre-modification recorded investment		$ 0	$ 2,714	$ 1,390	$ 5,157
Post-modification recorded investment	[1]	$ 0	$ 2,698	$ 1,374	$ 5,141
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	0	0	1
Pre-modification recorded investment		$ 0	$ 0	$ 0	$ 529
Post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 529
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts		0	1	0	3
Pre-modification recorded investment		$ 0	$ 70	$ 0	$ 742
Post-modification recorded investment	[1]	$ 0	$ 54	$ 0	$ 726
Payment Deferral [Member] | Construction, Development and Other Land [Member]
Total contracts		0	0	0	1
Pre-modification recorded investment		$ 0	$ 0	$ 0	$ 63
Post-modification recorded investment	[1]	$ 0	$ 0	$ 0	$ 63
Payment Deferral [Member] | Commercial and Industrial [Member]
Total contracts		0	1	0	2
Pre-modification recorded investment		$ 0	$ 1,106	$ 0	$ 1,708
Post-modification recorded investment	[1]	$ 0	$ 1,106	$ 0	$ 1,708
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts		0	2	1	3
Pre-modification recorded investment		$ 0	$ 1,538	$ 1,390	$ 2,115
Post-modification recorded investment	[1]	$ 0	$ 1,538	$ 1,374	$ 2,115
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts				0	0
Pre-modification recorded investment				$ 0	$ 0
Post-modification recorded investment				$ 0	$ 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=123577603&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=123577603&loc=SL6953676-111524

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- 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=123577603&loc=SL6953676-111524

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