Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Modifications [Line Items]
Number of Contracts	10		6
TDRs	$ 15,445	$ 2,100	$ 13,729
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	4		1
TDRs	$ 1,387		$ 227
Income Producing Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	4		3
TDRs	$ 8,512		$ 7,849
Owner Occupied Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		1
TDRs	$ 509		$ 565
Construction Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		1
TDRs	$ 5,037		$ 5,088
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
TDRs	15,230		13,502
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,172
Performing Financial Instruments [Member] | Income Producing Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
TDRs	8,512		7,849
Performing Financial Instruments [Member] | Owner Occupied Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
TDRs	509		565
Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
TDRs	5,037		5,088
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
TDRs	215		227
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 215		$ 227