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Note 11 - 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 - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Municipals Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 14,464 $ 10,170 $ 15,519 $ 9,223
Purchases   475 1,000 2,475
Transfer to held-to-maturity (4,510)   (4,510)  
Principal repayments (55) $ (53) (110) $ (1,106)
Maturities $ (2,000)   $ (4,000)  
Net gain from fair value adjustment of financial assets [1]        
Net gain from fair value adjustment of financial liabilities [1]        
Ending balance $ 7,899 $ 10,592 $ 7,899 $ 10,592
Trust Preferred Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 7,189 13,059 7,090 14,935
Sales       (1,871)
Net gain from fair value adjustment of financial assets [1] $ 37 $ 29 $ 131 $ 55
Net gain from fair value adjustment of financial liabilities [1]        
Change in unrealized gains included in other comprehensive income   $ 273 $ 5 $ 242
Ending balance $ 7,226 13,361 7,226 13,361
FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss   273 5 242
Junior Subordinated Debentures [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 28,245 $ 29,541 $ 28,771 $ 29,570
Net gain from fair value adjustment of financial assets [1]        
Net gain from fair value adjustment of financial liabilities [1] $ 1,229 $ (154) $ 705 $ (179)
Decrease in accrued interest payable 2 1   (3)
Ending balance $ 29,476 $ 29,388 $ 29,476 $ 29,388
[1] These totals in the table above are presented in the Consolidated Statement of Income under net gains (losses) from fair value adjustments.