Note 3 - Loans (Details) - Recorded Investment In Loans At The Dates Indicated (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred Loan Fees	$ (2,532)	$ (2,590)
Accrued Interest Receivable	4,316	4,120
Recorded Investment In Loans	1,181,537	1,103,478	1,097,588
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	438,529	383,641
Deferred Loan Fees	(846)	(814)
Accrued Interest Receivable	1,155	1,078
Recorded Investment In Loans	438,838	383,905
Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	731,940	702,051
Deferred Loan Fees	(1,445)	(1,595)
Accrued Interest Receivable	2,060	2,024
Recorded Investment In Loans	732,555	702,480	708,699
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	4,728	9,704
Deferred Loan Fees	(81)	(30)
Accrued Interest Receivable	18	18
Recorded Investment In Loans	4,665	9,692	7,711
Consumer And Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	5,623	7,531
Deferred Loan Fees	(160)	(151)
Accrued Interest Receivable	16	21
Recorded Investment In Loans	5,479	7,401	5,005
Recorded Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Loan Balance	1,180,820	1,102,927
Deferred Loan Fees	(2,532)	(2,590)
Accrued Interest Receivable	3,249	3,141
Recorded Investment In Loans	$ 1,181,537	$ 1,103,478