Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Mortgage Banking Revenue [Abstract]
Net realized gains on mortgage loans	$ 19,205	$ 23,856	$ 29,984	$ 41,107
Net change in unrealized gain on mortgage loans held for sale	3,884	(5,366)	7,167	(1,915)
Net change in fair value of mortgage loan commitments	5,329	(9,177)	17,365	(1,648)
Net change in the fair value of forward sales contracts	(5,992)	13,800	(13,113)	11,609
Total production revenue	22,426	23,113	41,403	49,153
Servicing revenue	15,798	13,733	31,251	27,013
Total mortgage banking revenue	$ 38,224	$ 36,846	$ 72,654	$ 76,166