Deposits - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Banking and Thrift [Abstract]
Brokered deposit placement fee	$ 2,600,000	$ 2,700,000	$ 5,200,000	$ 5,400,000
Third party broker fees paid	100,000	$ 0	2,900,000	$ 0
Deposits exceeding FDIC insurance limits	306,200,000		306,200,000		$ 709,900,000
Accrued interest on deposits	17,800,000		17,800,000		15,700,000
Deposits - non-interest bearing	$ 1,158,000		$ 1,158,000		$ 701,000