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Deposits - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits    
NOW account and other demand deposits $ 11,982 $ 10,743
Non-interest bearing demand deposits 22,469 20,040
Money market deposits 68,019 32,462
Passbook 38,031 37,836
Certificates of deposit 150,789 186,346
Total 291,290 287,427
Aggregate amount of certificates of deposits in denominations of $250,000 or more 16,700 53,500
CDARS    
Deposits    
Brokered deposits $ 52,800 $ 28,600