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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits [Abstract]    
Noninterest bearing demand $ 564,225 $ 363,351
Interest bearing demand 403,244 340,362
Individual retirement accounts 108,505 103,022
Money market 283,969 213,253
Savings 235,296 171,354
Certificates of deposit 837,384 756,351
Brokered deposits 188,725 68,092
Total deposits $ 2,621,348 $ 2,015,785