Deposits Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Interest checking	$ 5,999,245	$ 3,818,002
Money market	7,658,049	5,122,803
Savings	562,826	499,591
Time deposits $250,000 and under	994,197	2,065,733
Time deposits over $250,000	532,573	483,609
Total interest-bearing deposits	$ 15,746,890	$ 11,989,738