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Note 7 - Time Deposits (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Disclosure Text Block [Abstract]    
Time Deposits, $100,000 or More $ 625,755,000 $ 434,297,000
Time Deposit,$250,000 or More 186,352,000 106,603,000
Interest-bearing Domestic Deposit, Brokered 1,455,000 $ 7,427,000
Time Deposit Maturities, Next Twelve Months 945,950,000  
Time Deposit Maturities, Year Two 253,828,000  
Time Deposit Maturities, Year Three 70,174,000  
Time Deposit Maturities, Year Four 24,635,000  
Time Deposit Maturities, Year Five 25,357,000  
Time Deposit Maturities, after Year Five $ 73,000