Restructuring Charges (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) branches	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,140	$ (107)
Number of branches closed | branches	4
Gain on disposition of certain branch locations		157
Other operating expenses	$ 25,125	$ 20,522	$ 50
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,100