Deposits - Certificates of Deposits Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Time Deposits, Fiscal Year Maturity [Abstract]
One year or less	$ 4,934,933	$ 4,098,520
After one year to two years	4,279,406	2,045,861
After two years to three years	2,807,297	1,479,292
After three years to four years	1,285,504	494,654
After four years to five years	548,492	1,274,198
After five years	92,111	159,449
Total	$ 13,947,743	$ 9,551,974