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Borrowings - Maturities of FHLB advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Maturities of FHLB advances    
Total $ 56,612 $ 57,006
FHLB advances    
Maturities of FHLB advances    
Due within one year 417  
Due in one year to two years 304  
Due in two years to three years 55  
Due in three years to four years 57  
Due in four years to five years 59  
Thereafter 720  
Total $ 1,612 $ 2,006