Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Mortgage Banking Revenue [Abstract]
Net realized gains on sale of mortgage loans	$ 27,142	$ 18,968	$ 57,126	$ 60,075
Net change in unrealized gain on mortgage loans held for sale	(2,518)	6,666	4,649	4,751
Net change in the fair value of mortgage loan commitments	(6,901)	9,838	10,464	8,190
Net change in the fair value of forward sales contracts	8,267	(16,755)	(4,846)	(5,146)
Total production revenue	25,990	18,717	67,393	67,870
Servicing revenue	16,558	14,453	47,809	41,466
Total mortgage banking revenue	$ 42,548	$ 33,170	$ 115,202	$ 109,336