Note 4 - Loans and Allowance for Loan Losses (Details) - Loans Modified as Troubled Debt Restructurings (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Commercial:
Loans modified, number of contracts	4		6
Loans modified, pre-modification recorded principal balance	$ 22,781,000		$ 23,923,000
Loans modified, post-modification recorded principal balance	22,881,000		24,023,000
Commercial and Industrial [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	2	1	2	2
Loans modified, pre-modification recorded principal balance	5,994,000	553,000	5,994,000	613,000
Loans modified, post-modification recorded principal balance	6,094,000	553,000	6,094,000	613,000
Commercial and Industrial [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial and Industrial [Member]
Commercial:
Loans modified, number of contracts	2		2
Loans modified, pre-modification recorded principal balance	5,994,000		5,994,000
Loans modified, post-modification recorded principal balance	6,094,000		6,094,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	0	0	2
Loans modified, pre-modification recorded principal balance	0	0	0	3,247,000
Loans modified, post-modification recorded principal balance	0	0	0	3,247,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Real Estate Owner Occupied Loan [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	2	0	3	3
Loans modified, pre-modification recorded principal balance	16,787,000	0	17,783,000	909,000
Loans modified, post-modification recorded principal balance	16,787,000	0	17,783,000	909,000
Commercial Real Estate Owner Occupied Loan [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans modified, number of contracts	2		3
Loans modified, pre-modification recorded principal balance	16,787,000		17,783,000
Loans modified, post-modification recorded principal balance	16,787,000		17,783,000
Commercial Real Estate Non Owner Occupied Loan [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	2	1	4
Loans modified, pre-modification recorded principal balance	0	171,000	146,000	2,239,000
Loans modified, post-modification recorded principal balance	0	171,000	146,000	2,239,000
Commercial Real Estate Non Owner Occupied Loan [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans modified, number of contracts	0		1
Loans modified, pre-modification recorded principal balance	0		146,000
Loans modified, post-modification recorded principal balance	0		146,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	2	0	2
Loans modified, pre-modification recorded principal balance	0	346,000	0	346,000
Loans modified, post-modification recorded principal balance	0	346,000	0	346,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	4	5	6	13
Loans modified, pre-modification recorded principal balance	22,781,000	1,070,000	23,923,000	7,354,000
Loans modified, post-modification recorded principal balance	22,881,000	1,070,000	24,023,000	7,354,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Commercial Portfolio Segment [Member]
Commercial:
Loans modified, number of contracts	4		6
Loans modified, pre-modification recorded principal balance	22,781,000		23,923,000
Loans modified, post-modification recorded principal balance	22,881,000		24,023,000
Retail Home Equity and Other [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	0	0	0
Loans modified, pre-modification recorded principal balance	0	0	0	0
Loans modified, post-modification recorded principal balance	0	0	0	0
Retail Home Equity and Other [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Retail Home Equity and Other [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Retail 1-4 Family Mortgages [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	0	0	1
Loans modified, pre-modification recorded principal balance	0	0	0	1,879,000
Loans modified, post-modification recorded principal balance	0	0	0	1,879,000
Retail 1-4 Family Mortgages [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Retail 1-4 Family Mortgages [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Retail Loan [Member] | Originated Loan [Member]
Commercial:
Loans modified, number of contracts	0	0	0	1
Loans modified, pre-modification recorded principal balance	0	0	0	1,879,000
Loans modified, post-modification recorded principal balance	0	0	0	1,879,000
Retail Loan [Member] | Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Retail Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	0		0
Originated Loan [Member]
Commercial:
Loans modified, number of contracts	4	5	6	14
Loans modified, pre-modification recorded principal balance	22,781,000	1,070,000	23,923,000	9,233,000
Loans modified, post-modification recorded principal balance	22,881,000	1,070,000	24,023,000	9,233,000
Acquired Loan [Member]
Commercial:
Loans modified, number of contracts	0		0
Loans modified, pre-modification recorded principal balance	0		0
Loans modified, post-modification recorded principal balance	$ 0		$ 0