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Note 7 - Time Deposits (Details Textual) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Time Deposits, $100,000 or More $ 600,280,000 $ 625,755,000
Time Deposits, at or Above FDIC Insurance Limit 193,596,000 186,352,000
Interest-bearing Domestic Deposit, Brokered 7,040,000 $ 1,455,000
Time Deposit Maturities, Next Twelve Months 928,935,000  
Time Deposit Maturities, Year Two 240,219,000  
Time Deposit Maturities, Year Three 77,481,000  
Time Deposit Maturities, Year Four 27,852,000  
Time Deposit Maturities, Year Five 12,559,000  
Time Deposit Maturities, after Year Five $ 14,000