Noninterest Income Lending Related Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gains and Losses on Derivatives [Abstract]
Line of Credit Facility, Commitment Fee Amount	$ 34,110	$ 25,654	$ 24,025
Fees and Commissions, Other	9,155	7,741	8,511
Fees and Commissions	$ 43,265	$ 33,395	$ 32,536