Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Banking and Thrift [Abstract]
One year or less	$ 1,114,276	$ 1,107,667
After one year to two years	387,259	326,800
After two years to three years	246,992	230,468
After three years to four years	18,272	24,939
After four years	9,912	10,442
Total term certificate accounts	$ 1,776,711	$ 1,700,316