Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Brokered money market accounts	$ 208,348	$ 100,854
Demand and other noninterest-bearing	3,944,495	3,507,358
Interest-bearing demand	985,293	925,909
Money market	1,791,283	1,788,552
Savings	723,667	657,016
Certificates of deposit less than $100,000	304,830	359,878	[1]
Total core deposits	7,749,568	7,238,713
Certificates of deposit greater than $100,000	79,424	72,126	[1]
Certificates of deposit insured by CDARS®	22,039	26,901
Subtotal	8,059,379	7,438,594
Deposits, Valuation Adjustment From Acquisition Accounting	36	235
Total deposits	8,059,415	7,438,829
Deposit Liabilities Reclassified as Loans Receivable	4,400	$ 1,800
Time Deposits, Fiscal Year Maturity [Abstract]
2016	316,626
2017	48,312
2018	16,922
2019	13,624
2020	10,426
Thereafter	383
Total	$ 406,293

[1] Reclassified to conform to the current period’s presentation. The reclassification was limited to changing the threshold for certificates of deposit presented to the current FDIC insurance limit.