Restructuring Charges (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014 branches	Dec. 31, 2016 USD ($) branches	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 8,267	$ 36	$ 20,585
Number of branches closed | branches	13	9
Asset impairment charges		$ 8,107	229	7,530
Gain on sale of certain branch locations			401
Other operating expenses		91,283	91,370	$ 94,337
Continued Corporate Real Estate Optimization Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		5,300
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges		$ 2,800
Other operating expenses			$ 437