Noninterest Income Credit Card Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gains and Losses on Derivatives [Abstract]
Fees and Commissions, Credit and Debit Cards	$ 17,560	$ 13,971
Merchant Discount Fees	2,906	2,740
Fees and Commissions, Debit Cards	1,226	1,019
Credit card fees	$ 21,692	$ 17,730