Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Commercial and Industrial [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	$ 1,955,000		$ 1,170,000
Recorded principal balance, with no related allowance recorded	1,936,000		1,164,000
First quarter average recorded principal balance, with no related allowance recorded	1,550,000	358,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	5,296,000		5,299,000
Recorded principal balance, with an allowance recorded	5,165,000		5,226,000
Related allowance	2,776,000		1,578,000
First quarter average recorded principal balance, with an allowance recorded	5,196,000	1,197,000
Total impaired loans:
Related allowance	2,776,000		1,578,000
Commercial and Industrial [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	1,006,000		1,586,000
Recorded principal balance, with no related allowance recorded	956,000		1,579,000
First quarter average recorded principal balance, with no related allowance recorded	1,267,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	115,000		0
Recorded principal balance, with an allowance recorded	115,000		0
Related allowance	13,000		0
First quarter average recorded principal balance, with an allowance recorded	57,000
Total impaired loans:
Related allowance	13,000		0
Vacant Land and Land Development and Residential Construction Loan [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	535,000		540,000
Recorded principal balance, with no related allowance recorded	197,000		209,000
First quarter average recorded principal balance, with no related allowance recorded	203,000	353,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	2,000,000		2,000,000
Recorded principal balance, with an allowance recorded	2,000,000		2,000,000
Related allowance	232,000		151,000
First quarter average recorded principal balance, with an allowance recorded	2,000,000	4,023,000
Total impaired loans:
Related allowance	232,000		151,000
Vacant Land and Land Development and Residential Construction Loan [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	0		0
Recorded principal balance, with no related allowance recorded	0		0
First quarter average recorded principal balance, with no related allowance recorded	0
Commercial:
Unpaid contractual principal balance, with an allowance recorded	0		0
Recorded principal balance, with an allowance recorded	0		0
Related allowance	0		0
First quarter average recorded principal balance, with an allowance recorded	0
Total impaired loans:
Related allowance	0		0
Real Estate Owner Occupied Loan [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	3,629,000		3,609,000
Recorded principal balance, with no related allowance recorded	2,000,000		1,901,000
First quarter average recorded principal balance, with no related allowance recorded	1,950,000	735,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	15,729,000		15,745,000
Recorded principal balance, with an allowance recorded	15,518,000		15,674,000
Related allowance	2,179,000		2,200,000
First quarter average recorded principal balance, with an allowance recorded	15,596,000	1,500,000
Total impaired loans:
Related allowance	2,179,000		2,200,000
Real Estate Owner Occupied Loan [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	233,000		113,000
Recorded principal balance, with no related allowance recorded	206,000		113,000
First quarter average recorded principal balance, with no related allowance recorded	160,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	1,471,000		1,516,000
Recorded principal balance, with an allowance recorded	1,426,000		1,502,000
Related allowance	562,000		605,000
First quarter average recorded principal balance, with an allowance recorded	1,464,000
Total impaired loans:
Related allowance	562,000		605,000
Real Estate Non Owner Occupied Loan [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	198,000		1,210,000
Recorded principal balance, with no related allowance recorded	114,000		1,210,000
First quarter average recorded principal balance, with no related allowance recorded	662,000	1,247,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	15,682,000		16,033,000
Recorded principal balance, with an allowance recorded	15,682,000		15,949,000
Related allowance	4,394,000		4,779,000
First quarter average recorded principal balance, with an allowance recorded	15,816,000	20,262,000
Total impaired loans:
Related allowance	4,394,000		4,779,000
Real Estate Non Owner Occupied Loan [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	349,000		326,000
Recorded principal balance, with no related allowance recorded	308,000		326,000
First quarter average recorded principal balance, with no related allowance recorded	317,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	0		0
Recorded principal balance, with an allowance recorded	0		0
Related allowance	0		0
First quarter average recorded principal balance, with an allowance recorded	0
Total impaired loans:
Related allowance	0		0
Real Estate Multi Family and Residential Rental Loan [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	6,685,000		6,904,000
Recorded principal balance, with no related allowance recorded	4,556,000		4,801,000
First quarter average recorded principal balance, with no related allowance recorded	4,678,000	2,694,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	40,043,000		40,448,000
Recorded principal balance, with an allowance recorded	39,701,000		40,220,000
Related allowance	10,158,000		9,374,000
First quarter average recorded principal balance, with an allowance recorded	39,962,000	28,868,000
Total impaired loans:
Related allowance	10,158,000		9,374,000
Real Estate Multi Family and Residential Rental Loan [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	2,547,000		2,512,000
Recorded principal balance, with no related allowance recorded	2,411,000		2,505,000
First quarter average recorded principal balance, with no related allowance recorded	2,458,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	1,614,000		1,516,000
Recorded principal balance, with an allowance recorded	1,569,000		1,502,000
Related allowance	575,000		605,000
First quarter average recorded principal balance, with an allowance recorded	1,535,000
Total impaired loans:
Related allowance	575,000		605,000
Real Estate Multi Family and Residential Rental Loan [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	368,000		375,000
Recorded principal balance, with no related allowance recorded	309,000		317,000
First quarter average recorded principal balance, with no related allowance recorded	313,000	1,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	1,336,000		1,371,000
Recorded principal balance, with an allowance recorded	1,336,000		1,371,000
Related allowance	577,000		666,000
First quarter average recorded principal balance, with an allowance recorded	1,354,000	1,886,000
Total impaired loans:
Related allowance	577,000		666,000
Real Estate Multi Family and Residential Rental Loan [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	959,000		487,000
Recorded principal balance, with no related allowance recorded	941,000		487,000
First quarter average recorded principal balance, with no related allowance recorded	714,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	28,000		0
Recorded principal balance, with an allowance recorded	28,000		0
Related allowance	0		0
First quarter average recorded principal balance, with an allowance recorded	14,000
Total impaired loans:
Related allowance	0		0
Home Equity and Other [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	207,000		207,000
Recorded principal balance, with no related allowance recorded	190,000		191,000
First quarter average recorded principal balance, with no related allowance recorded	191,000	555,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	200,000		115,000
Recorded principal balance, with an allowance recorded	167,000		84,000
Related allowance	131,000		84,000
First quarter average recorded principal balance, with an allowance recorded	125,000	190,000
Total impaired loans:
Related allowance	131,000		84,000
Home Equity and Other [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	525,000		641,000
Recorded principal balance, with no related allowance recorded	368,000		639,000
First quarter average recorded principal balance, with no related allowance recorded	504,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	0		0
Recorded principal balance, with an allowance recorded	0		0
Related allowance	0		0
First quarter average recorded principal balance, with an allowance recorded	0
Total impaired loans:
Related allowance	0		0
1-4 Family Mortgages [Member] | Retail Loan [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	1,342,000		1,351,000
Recorded principal balance, with no related allowance recorded	724,000		751,000
First quarter average recorded principal balance, with no related allowance recorded	738,000	1,184,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	546,000		2,309,000
Recorded principal balance, with an allowance recorded	469,000		2,084,000
Related allowance	208,000		778,000
First quarter average recorded principal balance, with an allowance recorded	1,276,000	2,386,000
Total impaired loans:
Related allowance	208,000		778,000
1-4 Family Mortgages [Member] | Retail Loan [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	1,698,000		1,507,000
Recorded principal balance, with no related allowance recorded	1,291,000		1,505,000
First quarter average recorded principal balance, with no related allowance recorded	1,398,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	343,000		0
Recorded principal balance, with an allowance recorded	283,000		0
Related allowance	13,000		0
First quarter average recorded principal balance, with an allowance recorded	142,000
Total impaired loans:
Related allowance	13,000		0
1-4 Family Mortgages [Member] | Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	1,135,000		1,144,000
Recorded principal balance, with no related allowance recorded	534,000		560,000
First quarter average recorded principal balance, with no related allowance recorded	547,000	629,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	346,000		2,194,000
Recorded principal balance, with an allowance recorded	302,000		2,000,000
Related allowance	77,000		694,000
First quarter average recorded principal balance, with an allowance recorded	1,151,000	2,196,000
Total impaired loans:
Related allowance	77,000		694,000
1-4 Family Mortgages [Member] | Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	1,173,000		866,000
Recorded principal balance, with no related allowance recorded	923,000		866,000
First quarter average recorded principal balance, with no related allowance recorded	894,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	343,000		0
Recorded principal balance, with an allowance recorded	283,000		0
Related allowance	13,000		0
First quarter average recorded principal balance, with an allowance recorded	142,000
Total impaired loans:
Related allowance	13,000		0
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Commercial:
Related allowance	10,158,000		9,374,000
Total impaired loans:
Unpaid contractual principal balance	46,728,000		47,352,000
Recorded principal balance	44,257,000		45,021,000
Related allowance	10,158,000		9,374,000
First quarter average recorded principal balance	44,640,000	31,562,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Commercial:
Related allowance	575,000		605,000
Total impaired loans:
Unpaid contractual principal balance	4,161,000		4,028,000
Recorded principal balance	3,980,000		4,007,000
Related allowance	575,000		605,000
First quarter average recorded principal balance	3,993,000
Retail Loan [Member] | Originated Loan [Member]
Commercial:
Related allowance	208,000		778,000
Total impaired loans:
Unpaid contractual principal balance	1,888,000		3,660,000
Recorded principal balance	1,193,000		2,835,000
Related allowance	208,000		778,000
First quarter average recorded principal balance	2,014,000	3,570,000
Retail Loan [Member] | Acquired Loan [Member]
Commercial:
Related allowance	13,000		0
Total impaired loans:
Unpaid contractual principal balance	2,041,000		1,507,000
Recorded principal balance	1,574,000		1,505,000
Related allowance	13,000		0
First quarter average recorded principal balance	1,540,000
Originated Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	8,027,000		8,255,000
Recorded principal balance, with no related allowance recorded	5,280,000		5,552,000
First quarter average recorded principal balance, with no related allowance recorded	5,416,000	3,878,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	40,589,000		42,757,000
Recorded principal balance, with an allowance recorded	40,170,000		42,304,000
Related allowance	10,366,000		10,152,000
First quarter average recorded principal balance, with an allowance recorded	41,238,000	31,254,000
Total impaired loans:
Unpaid contractual principal balance	48,616,000		51,012,000
Recorded principal balance	45,450,000		47,856,000
Related allowance	10,366,000		10,152,000
First quarter average recorded principal balance	46,654,000	35,132,000
Acquired Loan [Member]
Commercial:
Unpaid contractual principal balance, with no related allowance recorded	4,245,000		4,019,000
Recorded principal balance, with no related allowance recorded	3,702,000		4,010,000
First quarter average recorded principal balance, with no related allowance recorded	3,856,000
Commercial:
Unpaid contractual principal balance, with an allowance recorded	1,957,000		1,516,000
Recorded principal balance, with an allowance recorded	1,852,000		1,502,000
Related allowance	588,000		605,000
First quarter average recorded principal balance, with an allowance recorded	1,677,000
Total impaired loans:
Unpaid contractual principal balance	6,202,000		5,535,000
Recorded principal balance	5,554,000		5,512,000
Related allowance	588,000		605,000
First quarter average recorded principal balance	$ 5,533,000