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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)		Sep. 30, 2018 USD ($)
Total contracts		1	1	5		2
Pre-modification recorded investment		$ 33	$ 11	$ 742		$ 52
Total below market interest rate	[1]	$ 29	$ 11	$ 727		$ 52
Below Market Interest Rate [Member]
Total contracts			1			1
Pre-modification recorded investment			$ 11			$ 11
Total below market interest rate			$ 11		[1]	$ 11	[1]
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts			1			1
Pre-modification recorded investment			$ 11			$ 11
Total below market interest rate	[1]		$ 11			$ 11
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts				4		1
Pre-modification recorded investment				$ 709		$ 41
Total below market interest rate	[1]			$ 698		$ 41
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts				2		1
Pre-modification recorded investment				$ 221		$ 41
Total below market interest rate	[1]			$ 218		$ 41
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts		1		2
Pre-modification recorded investment		$ 33		$ 488
Total below market interest rate	[1]	$ 29		$ 480
Payment Deferral [Member]
Total contracts		1	0	1
Pre-modification recorded investment		$ 33		$ 33
Total below market interest rate	[1]	$ 29		$ 29
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts				1
Pre-modification recorded investment				$ 33
Total below market interest rate				$ 29
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts
Pre-modification recorded investment
Total below market interest rate	[1]
[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=118936363&loc=SL6953676-111524

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X

- 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=118936363&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=118936363&loc=SL6953676-111524

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