Employee Benefit Plans (Other Investment Assets) (Details) - Nonqualified Supplemental Retirement Plans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3,308	$ 14,184
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,255
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,308	9,929
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,308	9,929
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,308	9,929
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,255
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,255
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0