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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Total contracts	10	2
Pre-modification recorded investment	$ 1,223	$ 52
Post-modification recorded investment	$ 1,152	$ 52
Total contracts, payment default		1
Recorded investment, payment default		$ 521
Single Family Owner Occupied [Member]
Total contracts, payment default		1
Recorded investment, payment default		$ 521
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts		1
Pre-modification recorded investment		$ 11
Post-modification recorded investment		$ 11
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts	6	1
Pre-modification recorded investment	$ 887	$ 41
Post-modification recorded investment	$ 871	$ 41
Payment Deferral [Member]
Total contracts	4
Pre-modification recorded investment	$ 336
Post-modification recorded investment	$ 281
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts	3
Pre-modification recorded investment	$ 331
Post-modification recorded investment	$ 279
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts	1
Pre-modification recorded investment	$ 5
Post-modification recorded investment	$ 2

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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- 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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- 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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- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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