Note 4 - Loans and Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Internal credit risk grade groupings:
Loans	$ 2,068,265,000	$ 1,053,243,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	248,213,000	208,151,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	107,038,000	76,237,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	7,078,000	1,985,000
Originated Loan [Member] | Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	362,329,000	286,373,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	7,451,000	6,973,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	19,774,000	25,535,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	3,021,000	4,233,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	30,246,000	36,741,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	169,127,000	156,230,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	78,049,000	103,066,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	19,896,000	2,581,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	267,072,000	261,877,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	270,074,000	219,325,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	118,498,000	122,717,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	13,190,000	22,024,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	401,762,000	364,066,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	17,812,000	15,465,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	22,758,000	19,469,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	1,823,000	2,705,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	42,393,000	37,639,000
Originated Loan [Member]
Internal credit risk grade groupings:
Loans	1,186,713,000	1,053,243,000	1,075,487,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	72,928,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	102,862,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	3,686,000
Acquired Loan [Member] | Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	179,476,000	0
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	4,931,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	15,711,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	1,330,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	21,972,000	0
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	35,824,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	100,845,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	8,729,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	145,398,000	0
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	69,611,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	105,564,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	7,485,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	182,660,000	0
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	24,144,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	28,654,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	458,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	53,256,000	0
Acquired Loan [Member]
Internal credit risk grade groupings:
Loans	881,552,000	0
Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	541,805,000	286,373,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	52,218,000	36,741,000
Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	412,470,000	261,877,000
Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	584,422,000	364,066,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	$ 95,649,000	$ 37,639,000