Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mortgage Banking Revenue [Abstract]
Net realized gains on mortgage loans held for sale	$ 17,100	$ 19,440	$ 39,025	$ 83,147
Net change in unrealized gain on mortgage loans held for sale	(3,110)	11,618	4,739	(4,091)
Change in fair value of mortgage loan commitments	(5,136)	12,657	5,824	(1,785)
Change in the fair value of forward sales commitments	5,839	(31,167)	(5,716)	(8,457)
Total production revenue	14,693	12,548	43,872	68,814
Servicing revenue	12,121	10,938	35,116	31,244
Total mortgage banking revenue	$ 26,814	$ 23,486	$ 78,988	$ 100,058