Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
One year or less	$ 1,543,088	$ 1,293,613
After one year to two years	390,328	548,995
After two years to three years	55,389	142,458
After three years to four years	24,618	11,362
After four years	47,555	16,717
Total term certificate accounts	$ 2,060,978	$ 2,013,145