Noninterest Income Credit Card Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gains and Losses on Derivatives [Abstract]
Fees and Commissions, Credit and Debit Cards	$ 60,224	$ 51,513	$ 46,185
Merchant Discount Fees	11,584	12,783	7,346
Fees and Commissions, Debit Cards	4,735	3,909	3,126
Credit card fees	$ 76,543	$ 68,205	$ 56,657