Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Mortgage Banking Revenue [Abstract]
Gain (Loss) on Sale of Mortgage Loans	$ 68,947	$ 67,407	$ 56,696
Net change in unrealized gain on mortgage loans held for sale	(5,311)	(784)	5,357
Change in fair value of mortgage loan commitments	1,599	(1,837)	7,315
Change in the fair value of forward sales commitments	4,393	4,801	(8,307)
Mortgage Production Revenue	69,628	69,587	61,061
Bank Servicing Fees	64,286	56,415	48,032
Mortgage banking revenue	$ 133,914	$ 126,002	$ 109,093