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Note 8 - Borrowings - Schedule of Remaining Contractual Maturities of Repurchase Agreements by Type of Collateral Pledged (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Remaining contractual maturities of repurchase agreements $ 90,653 $ 98,005
Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 64,844  
Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements 107  
Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 231  
Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 25,471  
US Government Agencies Debt Securities [Member]    
Remaining contractual maturities of repurchase agreements 30,230  
US Government Agencies Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 17,830  
US Government Agencies Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US Government Agencies Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US Government Agencies Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 12,400  
US States and Political Subdivisions Debt Securities [Member]    
Remaining contractual maturities of repurchase agreements 36,464  
US States and Political Subdivisions Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 36,464  
US States and Political Subdivisions Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US States and Political Subdivisions Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US States and Political Subdivisions Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements  
Mortgage-backed Agency Securities [Member]    
Remaining contractual maturities of repurchase agreements 23,959  
Mortgage-backed Agency Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 10,550  
Mortgage-backed Agency Securities [Member] | Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements 107  
Mortgage-backed Agency Securities [Member] | Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 231  
Mortgage-backed Agency Securities [Member] | Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements $ 13,071