Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	$ 23,678,000		$ 23,678,000		$ 6,689,000
Impaired loans with no related allowance recorded, recorded principal balance	21,048,000		21,048,000		3,500,000
Impaired loans with no related allowance recorded, average recorded principal balance	11,800,000	9,199,000	7,838,000	10,270,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	31,627,000		31,627,000		34,367,000
Impaired loans with an allowance recorded, recorded principal balance	31,168,000		31,168,000		33,368,000
Impaired loans, related allowance	11,364,000		11,364,000		12,386,000
Impaired loans with an allowance recorded, average recorded principal balance	29,611,000	42,777,000	30,432,000	42,963,000
Total impaired loans:
Impaired loans, unpaid contractual principal balance	55,305,000		55,305,000		41,056,000
Impaired loans, recorded principal balance	52,216,000		52,216,000		36,868,000
Impaired loans, related allowance	11,364,000		11,364,000		12,386,000
Impaired loans, average recorded principal balance	41,411,000	51,976,000	38,270,000	53,233,000
Commercial and Industrial [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	1,250,000		1,250,000		2,229,000
Impaired loans with no related allowance recorded, recorded principal balance	1,250,000		1,250,000		511,000
Impaired loans with no related allowance recorded, average recorded principal balance	691,000	1,170,000	525,000	1,378,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	5,404,000		5,404,000		1,517,000
Impaired loans with an allowance recorded, recorded principal balance	5,363,000		5,363,000		1,440,000
Impaired loans, related allowance	2,251,000		2,251,000		792,000
Impaired loans with an allowance recorded, average recorded principal balance	3,087,000	1,764,000	2,142,000	1,990,000
Total impaired loans:
Impaired loans, related allowance	2,251,000		2,251,000		792,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	545,000		545,000		475,000
Impaired loans with no related allowance recorded, recorded principal balance	222,000		222,000		362,000
Impaired loans with no related allowance recorded, average recorded principal balance	111,000	907,000	232,000	1,148,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	2,798,000		2,798,000		4,436,000
Impaired loans with an allowance recorded, recorded principal balance	2,798,000		2,798,000		4,139,000
Impaired loans, related allowance	318,000		318,000		844,000
Impaired loans with an allowance recorded, average recorded principal balance	3,049,000	4,466,000	3,536,000	3,158,000
Total impaired loans:
Impaired loans, related allowance	318,000		318,000		844,000
Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	19,499,000		19,499,000		1,270,000
Impaired loans with no related allowance recorded, recorded principal balance	17,815,000		17,815,000		785,000
Impaired loans with no related allowance recorded, average recorded principal balance	9,227,000	865,000	4,981,000	1,159,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	2,218,000		2,218,000		1,513,000
Impaired loans with an allowance recorded, recorded principal balance	2,016,000		2,016,000		1,513,000
Impaired loans, related allowance	628,000		628,000		528,000
Impaired loans with an allowance recorded, average recorded principal balance	2,238,000	2,330,000	1,869,000	2,810,000
Total impaired loans:
Impaired loans, related allowance	628,000		628,000		528,000
Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	575,000		575,000		895,000
Impaired loans with no related allowance recorded, recorded principal balance	575,000		575,000		733,000
Impaired loans with no related allowance recorded, average recorded principal balance	576,000	4,651,000	911,000	4,878,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	17,023,000		17,023,000		21,088,000
Impaired loans with an allowance recorded, recorded principal balance	17,023,000		17,023,000		21,072,000
Impaired loans, related allowance	6,489,000		6,489,000		7,969,000
Impaired loans with an allowance recorded, average recorded principal balance	17,377,000	28,789,000	18,819,000	30,216,000
Total impaired loans:
Impaired loans, related allowance	6,489,000		6,489,000		7,969,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	0		0		41,000
Impaired loans with no related allowance recorded, recorded principal balance	0		0		1,000
Impaired loans with no related allowance recorded, average recorded principal balance	0	425,000	0	487,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	1,861,000		1,861,000		3,219,000
Impaired loans with an allowance recorded, recorded principal balance	1,808,000		1,808,000		2,684,000
Impaired loans, related allowance	799,000		799,000		1,127,000
Impaired loans with an allowance recorded, average recorded principal balance	1,679,000	2,639,000	1,783,000	2,973,000
Total impaired loans:
Impaired loans, related allowance	799,000		799,000		1,127,000
Commercial Portfolio Segment [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	21,869,000		21,869,000		4,910,000
Impaired loans with no related allowance recorded, recorded principal balance	19,862,000		19,862,000		2,392,000
Impaired loans with no related allowance recorded, average recorded principal balance	10,605,000	8,018,000	6,649,000	9,050,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	29,304,000		29,304,000		31,773,000
Impaired loans with an allowance recorded, recorded principal balance	29,008,000		29,008,000		30,848,000
Impaired loans, related allowance	10,485,000		10,485,000		11,260,000
Impaired loans with an allowance recorded, average recorded principal balance	27,430,000	39,988,000	28,149,000	41,147,000
Total impaired loans:
Impaired loans, unpaid contractual principal balance	51,173,000		51,173,000		36,683,000
Impaired loans, recorded principal balance	48,870,000		48,870,000		33,240,000
Impaired loans, related allowance	10,485,000		10,485,000		11,260,000
Impaired loans, average recorded principal balance	38,035,000	48,006,000	34,798,000	50,197,000
Retail Home Equity and Other [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	707,000		707,000		507,000
Impaired loans with no related allowance recorded, recorded principal balance	639,000		639,000		461,000
Impaired loans with no related allowance recorded, average recorded principal balance	642,000	466,000	598,000	474,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	117,000		117,000		320,000
Impaired loans with an allowance recorded, recorded principal balance	87,000		87,000		289,000
Impaired loans, related allowance	87,000		87,000		96,000
Impaired loans with an allowance recorded, average recorded principal balance	88,000	309,000	139,000	339,000
Total impaired loans:
Impaired loans, related allowance	87,000		87,000		96,000
Retail 1-4 Family Mortgages [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	1,102,000		1,102,000		1,272,000
Impaired loans with no related allowance recorded, recorded principal balance	547,000		547,000		647,000
Impaired loans with no related allowance recorded, average recorded principal balance	553,000	715,000	591,000	746,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	2,206,000		2,206,000		2,274,000
Impaired loans with an allowance recorded, recorded principal balance	2,073,000		2,073,000		2,231,000
Impaired loans, related allowance	792,000		792,000		1,030,000
Impaired loans with an allowance recorded, average recorded principal balance	2,093,000	2,480,000	2,144,000	1,477,000
Total impaired loans:
Impaired loans, related allowance	792,000		792,000		1,030,000
Retail Loan [Member]
Commercial:
Impaired loans with no related allowance recorded, unpaid contractual principal balance	1,809,000		1,809,000		1,779,000
Impaired loans with no related allowance recorded, recorded principal balance	1,186,000		1,186,000		1,108,000
Impaired loans with no related allowance recorded, average recorded principal balance	1,195,000	1,181,000	1,189,000	1,220,000
Commercial:
Impaired loans with an allowance recorded, unpaid contractual principal balance	2,323,000		2,323,000		2,594,000
Impaired loans with an allowance recorded, recorded principal balance	2,160,000		2,160,000		2,520,000
Impaired loans, related allowance	879,000		879,000		1,126,000
Impaired loans with an allowance recorded, average recorded principal balance	2,181,000	2,789,000	2,283,000	1,816,000
Total impaired loans:
Impaired loans, unpaid contractual principal balance	4,132,000		4,132,000		4,373,000
Impaired loans, recorded principal balance	3,346,000		3,346,000		3,628,000
Impaired loans, related allowance	879,000		879,000		1,126,000
Impaired loans, average recorded principal balance	$ 3,376,000	$ 3,970,000	$ 3,472,000	$ 3,036,000