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Note 8 - Borrowings - Schedule of Remaining Contractual Maturities of Repurchase Agreements by Type of Collateral Pledged (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Remaining contractual maturities of repurchase agreements $ 86,011 $ 98,005
Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 60,358  
Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements  
Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 9  
Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 25,644  
US Government Agencies Debt Securities [Member]    
Remaining contractual maturities of repurchase agreements 16,573  
US Government Agencies Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 13,173  
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 3,400  
US Treasury Securities [Member]    
Remaining contractual maturities of repurchase agreements 11,634  
US Treasury Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 2,634  
US Treasury Securities [Member] | Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US Treasury Securities [Member] | Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements  
US Treasury Securities [Member] | Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 9,000  
US States and Political Subdivisions Debt Securities [Member]    
Remaining contractual maturities of repurchase agreements 39,296  
US States and Political Subdivisions Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 39,296  
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 18,508  
Mortgage-backed Agency Securities [Member] | Maturity Overnight and Continuous [Member]    
Remaining contractual maturities of repurchase agreements 5,255  
Mortgage-backed Agency Securities [Member] | Maturity Less than 30 Days [Member]    
Remaining contractual maturities of repurchase agreements  
Mortgage-backed Agency Securities [Member] | Maturity 30 to 90 Days [Member]    
Remaining contractual maturities of repurchase agreements 9  
Mortgage-backed Agency Securities [Member] | Maturity Greater than 90 Days [Member]    
Remaining contractual maturities of repurchase agreements $ 13,244