Note 4 - Loans and Allowance for Loan Losses (Details) - Age Analysis of Past Due Loans (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Commercial:
Loans	$ 2,073,482,000	$ 1,053,243,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial and Industrial [Member]
Commercial:
Loans, past due 30 - 59 days	0	0
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	121,000	309,000
Loans, past due	121,000	309,000
Loans, current	342,254,000	286,064,000
Loans	342,375,000	286,373,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans, past due 30 - 59 days	0	0
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	0	0
Loans, past due	0	0
Loans, current	32,214,000	36,741,000
Loans	32,214,000	36,741,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans, past due 30 - 59 days	35,000	65,000
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	90,000	50,000
Loans, past due	125,000	115,000
Loans, current	264,471,000	261,762,000
Loans	264,596,000	261,877,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans, past due 30 - 59 days	0	0
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	0	0
Loans, past due	0	0
Loans, current	399,855,000	364,066,000
Loans	399,855,000	364,066,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans, past due 30 - 59 days	0	0
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	0	64,000
Loans, past due	0	64,000
Loans, current	37,569,000	37,575,000
Loans	37,569,000	37,639,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Commercial Portfolio Segment [Member]
Commercial:
Loans, past due 30 - 59 days	35,000	65,000
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	211,000	423,000
Loans, past due	246,000	488,000
Loans, current	1,076,363,000	986,208,000
Loans	1,076,609,000	986,696,000	985,616,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Retail Home Equity and Other [Member]
Commercial:
Loans, past due 30 - 59 days	2,000	14,000
Loans, past due 60 - 89 days	0	0
Loans, past due greater than 89 days	0	0
Loans, past due	2,000	14,000
Loans, current	35,149,000	35,066,000
Loans	35,151,000	35,080,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Retail 1-4 Family Mortgages [Member]
Commercial:
Loans, past due 30 - 59 days	0	21,000
Loans, past due 60 - 89 days	0	44,000
Loans, past due greater than 89 days	347,000	375,000
Loans, past due	347,000	440,000
Loans, current	32,990,000	31,027,000
Loans	33,337,000	31,467,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member] | Retail Loan [Member]
Commercial:
Loans, past due 30 - 59 days	2,000	35,000
Loans, past due 60 - 89 days	0	44,000
Loans, past due greater than 89 days	347,000	375,000
Loans, past due	349,000	454,000
Loans, current	68,139,000	66,093,000
Loans	68,488,000	66,547,000	73,046,000
Loans, past due 89 days and accruing	0	0
Originated Loan [Member]
Commercial:
Loans, past due 30 - 59 days	37,000	100,000
Loans, past due 60 - 89 days	0	44,000
Loans, past due greater than 89 days	558,000	798,000
Loans, past due	595,000	942,000
Loans, current	1,144,502,000	1,052,301,000
Loans	1,145,097,000	1,053,243,000	1,058,662,000
Loans, past due 89 days and accruing	0	0
Acquired Loan [Member] | Commercial and Industrial [Member]
Commercial:
Loans, past due 30 - 59 days	587,000
Loans, past due 60 - 89 days	19,000
Loans, past due greater than 89 days	1,202,000
Loans, past due	1,808,000
Loans, current	271,876,000
Loans	273,684,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans, past due 30 - 59 days	0
Loans, past due 60 - 89 days	0
Loans, past due greater than 89 days	748,000
Loans, past due	748,000
Loans, current	20,343,000
Loans	21,091,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans, past due 30 - 59 days	363,000
Loans, past due 60 - 89 days	0
Loans, past due greater than 89 days	949,000
Loans, past due	1,312,000
Loans, current	118,506,000
Loans	119,818,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans, past due 30 - 59 days	65,000
Loans, past due 60 - 89 days	1,347,000
Loans, past due greater than 89 days	1,436,000
Loans, past due	2,848,000
Loans, current	146,586,000
Loans	149,434,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans, past due 30 - 59 days	0
Loans, past due 60 - 89 days	0
Loans, past due greater than 89 days	0
Loans, past due	0
Loans, current	47,099,000
Loans	47,099,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Commercial Portfolio Segment [Member]
Commercial:
Loans, past due 30 - 59 days	1,015,000
Loans, past due 60 - 89 days	1,366,000
Loans, past due greater than 89 days	4,335,000
Loans, past due	6,716,000
Loans, current	604,410,000
Loans	611,126,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Retail Home Equity and Other [Member]
Commercial:
Loans, past due 30 - 59 days	681,000
Loans, past due 60 - 89 days	142,000
Loans, past due greater than 89 days	12,000
Loans, past due	835,000
Loans, current	133,722,000
Loans	134,557,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Retail 1-4 Family Mortgages [Member]
Commercial:
Loans, past due 30 - 59 days	1,796,000
Loans, past due 60 - 89 days	115,000
Loans, past due greater than 89 days	860,000
Loans, past due	2,771,000
Loans, current	179,931,000
Loans	182,702,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member] | Retail Loan [Member]
Commercial:
Loans, past due 30 - 59 days	2,477,000
Loans, past due 60 - 89 days	257,000
Loans, past due greater than 89 days	872,000
Loans, past due	3,606,000
Loans, current	313,653,000
Loans	317,259,000	0
Loans, past due 89 days and accruing	0
Acquired Loan [Member]
Commercial:
Loans, past due 30 - 59 days	3,492,000
Loans, past due 60 - 89 days	1,623,000
Loans, past due greater than 89 days	5,207,000
Loans, past due	10,322,000
Loans, current	918,063,000
Loans	928,385,000	0
Loans, past due 89 days and accruing	0
Commercial and Industrial [Member]
Commercial:
Loans	616,059,000	286,373,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans	53,305,000	36,741,000
Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans	384,414,000	261,877,000
Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans	549,289,000	364,066,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans	84,668,000	37,639,000
Commercial Portfolio Segment [Member]
Commercial:
Loans	1,687,735,000	986,696,000
Retail Home Equity and Other [Member]
Commercial:
Loans	169,708,000	35,080,000
Retail 1-4 Family Mortgages [Member]
Commercial:
Loans	216,039,000	31,467,000
Retail Loan [Member]
Commercial:
Loans	$ 385,747,000	$ 66,547,000