Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
One year or less	$ 1,107,667	$ 669,610
After one year to two years	326,800	474,475
After two years to three years	230,468	169,069
After three years to four years	24,939	68,184
After four years	10,442	22,544
Total term certificate accounts	$ 1,700,316	$ 1,403,882