Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (SERP) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 70	$ 76
Interest cost	413	435
Amortization of prior service cost	3	3
Net pension expense/(credit) included in employee benefits	(1)	53
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	26	25
Interest cost	72	62
Amortization of recognized (gain)/ loss	37	19
Amortization of prior service cost	(1)	5
Net pension expense/(credit) included in employee benefits	$ 134	$ 111