Note 18 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Carried at Fair Value on a Recurring Basis, Classified Within Level 3 of the Valuation Hierarchy (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Municipal [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 9,223	$ 9,429
Purchases	7,595
Principal repayments	(214)	(206)
Maturities	(1,085)
Ending balance	15,519	9,223
Municipal [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Ending balance	15,519
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	14,935	6,650
Sales	(11,133)
Net gain from fair value adjustment of financial assets	71	884
Change in unrealized gains included in other comprehensive income	3,217	1,275
Ending balance	7,090	14,935
Changes in unrealized held at period end	3,217	1,275
Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Ending balance	7,090
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	29,570	23,922
Net gain from fair value adjustment of financial liabilities	(801)	5,651
Increase in accrued interest payable	2	(3)
Ending balance	28,771	29,570
Junior Subordinated Debentures [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Ending balance	$ 28,771