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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts		3
Pre-modification recorded investment		$ 678
Post-modification recorded investment		$ 676
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		2
Pre-modification recorded investment		$ 374
Post-modification recorded investment	[1]	$ 372
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts		1
Pre-modification recorded investment		$ 304
Post-modification recorded investment	[1]	$ 304
Below Market Interest Rate and Extended Payment Term [Member] | Consumer Loans [Member]
Total contracts
Pre-modification recorded investment
Post-modification recorded investment
Below Market Interest Rate and Extended Payment Term [Member] | Other Receivables [Member]
Total contracts
Pre-modification recorded investment
Post-modification recorded investment
Payment Deferral [Member]
Total contracts		2
Pre-modification recorded investment		$ 70
Post-modification recorded investment		$ 53
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts		1
Pre-modification recorded investment		$ 66
Post-modification recorded investment		$ 49
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts		1
Pre-modification recorded investment		$ 4
Post-modification recorded investment		$ 4
[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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