Intangible Assets (Carrying and Fair Value of MSRs) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Loans serviced for others that have servicing rights capitalized	$ 2,129,492	$ 2,093,140	$ 875,720
Mortgage servicing rights [Member]
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Net carrying value of MSRs	11,540	12,217	3,293
Fair value of MSRs	$ 15,326	$ 14,979	$ 6,618