Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of Deposits
Noninterest-bearing demand	$ 3,341,520	$ 1,934,583
Interest-bearing demand	2,825,801	1,870,197
Savings and money market accounts	3,695,434	2,004,575
Time deposits over $100,000	1,682,986	701,830
Other time deposits	1,327,381	945,582
Total deposits	12,873,122	7,456,767
Demand deposit overdrafts	5,000	3,000
Time Deposits, $250,000 or More	975,400	$ 364,000
Maturities of Time Deposits
2017	2,159,477
2018	393,811
2019	167,132
2020	139,555
2021	142,146
Thereafter	8,246
Total	$ 3,010,367