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Deposits - Components of deposit liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deposits by type:    
Savings $ 105,098 $ 81,383
Money market 250,749 239,241
NOW accounts 247,623 227,167
Time, $250,000 or more 39,284 42,149
Time, under $250,000 117,410 97,554
Total deposit liabilities $ 760,164 $ 687,494