Deposits Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deposits [Abstract]
Interest checking	$ 3,818,002	$ 2,972,357
Money market	5,122,803	5,432,169
Savings	499,591	571,422
Time deposits $250,000 and under	2,065,733	1,593,453
Time deposits over $250,000	483,609	412,185
Total interest-bearing deposits	$ 11,989,738	$ 10,981,586