Intangible Assets (Carrying and Fair Value of MSRs) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Loans serviced for others that have servicing rights capitalized	$ 2,193,067	$ 2,093,140	$ 871,158
Mortgage servicing rights [Member]
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Net carrying value of MSRs	12,307	12,217	3,344
Fair value of MSRs	$ 16,602	$ 14,979	$ 6,433