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Deposits - Components of Interest-bearing and Noninterest-bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deposits.    
Money market accounts $ 224,414 $ 197,258
Now accounts 330,914 279,004
Savings accounts 394,033 386,593
Time deposits less than $100 233,513 237,176
Time deposits $100 or more 52,197 34,801
Interest-bearing Deposit Liabilities, Total 1,235,071 1,134,832
Noninterest-bearing deposits 353,686 320,978
Total deposits $ 1,588,757 $ 1,455,810