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Note 8 - Borrowings - Contractual Maturities of Repurchase Agreements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
[1]
Repurchase agreements $ 29,115 $ 30,086
Maturity Overnight and Continuous [Member]    
Repurchase agreements 4,038  
Maturity Less than 30 Days [Member]    
Repurchase agreements  
Maturity 30 to 90 Days [Member]    
Repurchase agreements 77  
Maturity Greater than 90 Days [Member]    
Repurchase agreements 25,000  
US Treasury Securities [Member]    
Repurchase agreements 9,000  
US Treasury Securities [Member] | Maturity Overnight and Continuous [Member]    
Repurchase agreements  
US Treasury Securities [Member] | Maturity Less than 30 Days [Member]    
Repurchase agreements  
US Treasury Securities [Member] | Maturity 30 to 90 Days [Member]    
Repurchase agreements  
US Treasury Securities [Member] | Maturity Greater than 90 Days [Member]    
Repurchase agreements 9,000  
US Government Agencies Debt Securities [Member]    
Repurchase agreements 4,680  
US Government Agencies Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Repurchase agreements  
US Government Agencies Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Repurchase agreements  
US Government Agencies Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Repurchase agreements  
US Government Agencies Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Repurchase agreements 4,680  
US States and Political Subdivisions Debt Securities [Member]    
Repurchase agreements 2,378  
US States and Political Subdivisions Debt Securities [Member] | Maturity Overnight and Continuous [Member]    
Repurchase agreements 2,378  
US States and Political Subdivisions Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Repurchase agreements  
US States and Political Subdivisions Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Repurchase agreements  
US States and Political Subdivisions Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Repurchase agreements  
Mortgage-backed Agency Securities [Member]    
Repurchase agreements 13,057  
Mortgage-backed Agency Securities [Member] | Maturity Overnight and Continuous [Member]    
Repurchase agreements 1,660  
Mortgage-backed Agency Securities [Member] | Maturity Less than 30 Days [Member]    
Repurchase agreements  
Mortgage-backed Agency Securities [Member] | Maturity 30 to 90 Days [Member]    
Repurchase agreements 77  
Mortgage-backed Agency Securities [Member] | Maturity Greater than 90 Days [Member]    
Repurchase agreements $ 11,320  
[1] Derived from audited financial statements