Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	$ 57,246	$ 34,597	$ 57,918
Collectively evaluated for impairment	3,006,729	2,910,561	2,490,106
Ending balance	3,063,975	2,945,158	2,548,024
Commercial Loan [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	27,327	9,614	14,395
Collectively evaluated for impairment	677,059	684,736	565,223
Ending balance	704,386	694,350	579,618
Commercial Real Estate Investment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	2,508	2,682	5,564
Collectively evaluated for impairment	1,193,897	1,117,118	905,265
Ending balance	1,196,405	1,119,800	910,829
Commercial Real Estate Owner Occupied [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	7,323	7,574	6,449
Collectively evaluated for impairment	313,671	309,917	297,112
Ending balance	320,994	317,491	303,561
Residential Mortgage [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	113	113
Collectively evaluated for impairment	97,733	90,305	69,256
Ending balance	97,846	90,418	69,256
Home Equity Line of Credit [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	756	682	538
Collectively evaluated for impairment	108,083	109,560	108,032
Ending balance	108,839	110,242	108,570
Consumer, Other [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	60	70
Collectively evaluated for impairment	5,998	3,961	4,117
Ending balance	6,058	4,031	4,117
Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment in Loans [Line Items]
Individually evaluated for impairment	19,159	13,862	30,972
Collectively evaluated for impairment	610,288	594,964	541,101
Ending balance	$ 629,447	$ 608,826	$ 572,073