Presentation of Debt Issuance Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other assets	$ 29,847	$ 24,096
Total assets	4,091,000	4,015,909
Subordinated debentures	54,392	54,343
Total liabilities	$ 3,616,273	3,538,565
As previously reported [Member]
Other assets		24,908
Total assets		4,016,721
Subordinated debentures		55,155
Total liabilities		3,539,377
As reported under the new guidance [Member]
Other assets		24,096
Total assets		4,015,909
Subordinated debentures		54,343
Total liabilities		$ 3,538,565