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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Municipal Debt Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 15,519  
Ending balance 7,212 $ 15,519
Trust Preferred Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 7,090  
Ending balance   7,090
Junior Subordinated Debentures [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 28,771  
Ending balance 29,018 28,771
Fair Value, Inputs, Level 3 [Member] | Municipal Debt Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 15,519 9,223
Transfers to held-to-maturity (4,510)  
Purchases 1,000 7,595
Principal repayments (8,009) (214)
Maturities (4,000) (1,085)
Ending balance   15,519
Fair Value, Inputs, Level 3 [Member] | Trust Preferred Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 7,090 14,935
Sales   (11,133)
Net gain from fair value adjustment of financial assets (1) [1] 117 71
Change in unrealized gains included in other comprehensive income 5 3,217
Ending balance 7,212 7,090
Changes in unrealized held at period end 5 3,217
Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 28,771 29,570
Net loss from fair value adjustment of financial liabilities (1) [1] 238 (801)
Increase in accrued interest payable 9 2
Ending balance $ 29,018 $ 28,771
[1] These totals in the tables above are presented in the Consolidated Statement of Income under net gains (losses) from fair value adjustments.