Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment In Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) - The Company’s Recorded Investment In Loans [Line Items]
Individually evaluated for impairment	$ 43,298	$ 72,356	$ 68,921
Collectively evaluated for impairment	2,753,542	2,420,739	2,328,748
Ending balance	2,796,840	2,493,095	2,397,669
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	12,791	15,177	14,054
Collectively evaluated for impairment	669,622	529,893	520,079
Ending balance	682,413	545,070	534,133
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	3,238	11,401	11,624
Collectively evaluated for impairment	1,036,537	903,237	931,146
Ending balance	1,039,775	914,638	942,770
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	8,547	8,723	6,455
Collectively evaluated for impairment	325,531	289,134	299,693
Ending balance	334,078	297,857	306,148
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
Collectively evaluated for impairment	78,948	61,871	57,952
Ending balance	79,061	61,871	57,952
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	570	510	670
Collectively evaluated for impairment	108,319	106,334	98,260
Ending balance	108,889	106,844	98,930
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	45	43	8
Collectively evaluated for impairment	9,314	4,242	5,035
Ending balance	9,359	4,285	5,043
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	17,994	36,502	36,110
Collectively evaluated for impairment	525,271	526,028	416,583
Ending balance	$ 543,265	$ 562,530	$ 452,693