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Note 4 - Credit Quality - Loans Modified as Trouble Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Pre-modification Recorded Investment	$ 1,190	$ 115	$ 1,190	$ 115
Post-modification Recorded Investment	$ 1,190	$ 115	$ 1,190	$ 115
Total Contracts	6	1	6	1
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Pre-modification Recorded Investment	$ 241		$ 241
Post-modification Recorded Investment	$ 241		$ 241
Total Contracts	1		1
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Pre-modification Recorded Investment	$ 949	$ 115	$ 949	$ 115
Post-modification Recorded Investment	$ 949	$ 115	$ 949	$ 115
Total Contracts	5	1	5	1

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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