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Note 1 - Significant Accounting Policies (Details Textual)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
shares
Dec. 31, 2015
USD ($)
Restricted Stock [Member]          
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights 150,000 100,000 150,000 100,000  
Employee Stock Option [Member]          
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 92,000 108,000 92,000 108,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7,000 91,000 7,000 91,000  
Mortgage Loans [Member]          
Servicing Asset | $ $ 597.0   $ 597.0    
Core Deposits [Member]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years    
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5   5    
Interest Income on Commercial and Mortgage Loans Discontinued Period     90 days    
Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged Off     120 days    
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | $ $ 2.9   $ 2.9   $ 1.3