Deposits - Interest-bearing or Noninterest-bearing (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
U.S.:
Interest-bearing	$ 9,782,957	$ 10,393,449
Noninterest-bearing	5,188,696	5,368,729
Foreign:
Interest-bearing	781,965	748,678
Noninterest-bearing	691,376	639,212
Total deposits	$ 16,444,994	$ 17,150,068