v3.8.0.1
Deposits - Summary of Outstanding Balance of Deposits and Average Rates (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Demand deposits, Noninterest-bearing $ 1,170,927 $ 1,097,196
Demand deposits, Interest-bearing 353,080 235,294
Money market and savings 1,074,814 1,210,240
Certificates of deposits 1,037,371 900,797
Total $ 3,636,192 $ 3,443,527
Demand deposits, Noninterest-bearing, Weighted Average Rate   0.00%
Demand deposits, Interest-bearing, Weighted Average Rate 0.678% 0.411%
Money market and savings, Weighted Average Rate 0.868% 0.84%
Certificates of deposits, Weighted Average Rate 1.419% 1.189%
Total, Weighted Average Rate 0.727% 0.634%