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Deposits - Narrative (Details)
Dec. 31, 2016
USD ($)
bank
Dec. 31, 2015
USD ($)
Deposits [Line Items]    
Certificates of deposit $ 131,715,000  
CD collateralized by FHLB letters of credit 0 $ 0
Securities pledged to collateralize certificates of deposit 0 0
Deposits held for related parties $ 2,500,000 3,400,000
CDARS    
Deposits [Line Items]    
Number of banks in, more than | bank 3,000  
Percentage of coverage of certificates of deposit in CDARS 100.00%  
Certificates of deposit $ 0 $ 0