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
Receivables [Abstract]
Loans and Leases Receivable, Net of Deferred Income	$ 2,073,482,000		$ 2,073,482,000		$ 1,053,243,000
Loans and Leases Receivable Period Increase (Decrease)			1,020,000,000
Loans and Leases Receivable, Percentage, Period Increase (Decrease)			96.90%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	42,600,000		42,600,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	26,100,000		26,100,000
Impaired Financing Receivable, Interest Income, Accrual Method	$ 400,000	$ 700,000	$ 800,000	$ 1,300,000
Loans Modified as Troubled Debt Restructuring Due Period	30 days	30 days	30 days	30 days