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Note 8 - Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Note 8 - Deposits (Details) [Line Items]    
Interest-bearing Domestic Deposit, Brokered $ 982,800 $ 763,900
Time Deposits, $250,000 or More 169,200 109,600
Deposits 3,892,547 3,508,598
Denomination [Member]    
Note 8 - Deposits (Details) [Line Items]    
Interest-bearing Domestic Deposit, Brokered 1,000,000  
Letter of Credit Pledged as Collateral [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposit Liabilities, Collateral Issued, Financial Instruments 494,000  
Government Deposits [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposits 975,900 891,900
Government Deposits [Member] | ICS Deposits [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposits 210,700 94,000
Government Deposits [Member] | Collateralized Deposits [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposits 765,200 797,900
Government Deposits [Member] | Securities Pledged as Collateral [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposit Liabilities, Collateral Issued, Financial Instruments 364,700 379,300
Government Deposits [Member] | Letter of Credit Pledged as Collateral [Member]    
Note 8 - Deposits (Details) [Line Items]    
Deposit Liabilities, Collateral Issued, Financial Instruments $ 494,000 $ 499,100