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Note 5 - Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 1,165	$ 1,171
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 207	$ 211
Commercial Portfolio Segment [Member]
Number of Contracts	4	4
TDRs Performing to Modified Terms	$ 1,372	$ 1,382
Income Producing Portfolio Segment [Member] | Performing Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 5,143	$ 5,160
Income Producing Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
TDRs Performing to Modified Terms
Income Producing Portfolio Segment [Member]
Number of Contracts	2	2
TDRs Performing to Modified Terms	$ 5,143	$ 5,160
Owner Occupied Portfolio Segment [Member] | Performing Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 461	$ 485
Owner Occupied Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
TDRs Performing to Modified Terms
Owner Occupied Portfolio Segment [Member]
Number of Contracts	1	1
TDRs Performing to Modified Terms	$ 461	$ 485
Construction Portfolio Segment [Member] | Performing Financial Instruments [Member]
TDRs Performing to Modified Terms		$ 5,020
Construction Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 5,013
Construction Portfolio Segment [Member]
Number of Contracts	1	1
TDRs Performing to Modified Terms	$ 5,013	$ 5,020
Performing Financial Instruments [Member]
TDRs Performing to Modified Terms	6,769	11,836
Nonperforming Financial Instruments [Member]
TDRs Performing to Modified Terms	$ 5,220	$ 211
Number of Contracts	8	8
TDRs Performing to Modified Terms	$ 11,989	$ 12,047

X

- Definition

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

+ References

No definition available.

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X

- 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=66008989&loc=SL6953676-111524

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