Note 4 - Loans and Allowance for Loan Losses (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	$ 2,390,000,000		$ 2,390,000,000		$ 2,400,000,000
Impaired Financing Receivable, Recorded Investment	18,556,000		18,556,000		18,316,000
Impaired Financing Receivable, Related Allowance	2,012,000		2,012,000		1,960,000
Impaired Financing Receivable, Interest Income, Accrual Method	158,000	210,000	364,000	505,000
Impaired Financing Receivable, Average Recorded Investment	18,743,000	21,201,000	18,601,000	24,403,000
Financing Receivable, Modifications, Number of Contracts	1		2	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	599,000		1,630,000	321,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Student Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	398,000		398,000		25,906,000
Percentage of Portfolio	97.00%		97.00%
Restructured During Current Period [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts	1		2	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	599,000		1,630,000	321,000
Metropolitan [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Acquired Impaired Loans, Carrying Value	23,400,000		23,400,000		27,400,000
Loans And Leases Receivable Classified	23,500,000		23,500,000		31,200,000
Risk Ratings 6,7, and 8 [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans And Leases Receivable Classified	$ 83,800,000		$ 83,800,000		$ 94,500,000