Note 3 - Loans (Details) - Recorded Investment In Loans At The Dates Indicated (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred Loan Fees	$ (2,740)	$ (2,590)
Accrued Interest Receivable	3,753	4,120
Recorded Investment In Loans	1,187,850	1,103,478	1,100,060
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	439,420	383,641
Deferred Loan Fees	(956)	(814)
Accrued Interest Receivable	1,137	1,078
Recorded Investment In Loans	439,601	383,905
Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	734,978	702,051
Deferred Loan Fees	(1,549)	(1,595)
Accrued Interest Receivable	1,851	2,024
Recorded Investment In Loans	735,280	702,480	708,121
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	8,683	9,704
Deferred Loan Fees	(101)	(30)
Accrued Interest Receivable	25	18
Recorded Investment In Loans	8,607	9,692	7,907
Consumer And Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	4,483	7,531
Deferred Loan Fees	(134)	(151)
Accrued Interest Receivable	13	21
Recorded Investment In Loans	4,362	7,401	6,723
Recorded Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	1,187,564	1,102,927
Deferred Loan Fees	(2,740)	(2,590)
Accrued Interest Receivable	3,026	3,141
Recorded Investment In Loans	$ 1,187,850	$ 1,103,478