Employee Benefit Plans Narrative Data (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Minimum Required Contribution	$ 0	$ 0
Expected pension adjustment to AOCI for 2017	203,000
Estimated net periodic pension benefit for 2017	$ 202,000
Weighted average assumptions, pension benefit obligation, discount rate	3.99%	4.17%	3.83%
Weighted average assumptions, pension benefit obligation, rate of compensation increase	0.00%	0.00%	0.00%
Weighted average assumptions, net periodic benefit cost, discount rate	4.17%	3.83%	4.84%
Weighted average assumptions, net periodic benefit cost, rate of compensation increase	0.00%	0.00%	0.00%
Weighted average assumptions, net periodic benefit cost, expected long-term rate of return on plan assets	6.75%	6.75%	6.75%
Minimum required employer contribution for 2017	$ 0
Deferred Compensation Arrangements [Abstract]
Deferred compensation expense	9,000	$ 8,000	$ 8,000
Deferred compensation accrued benefit liability	613,000	699,000
Cash surrender value of life insurance policies purchased to fund the deferred compensation plan	945,000	1,300,000
General unsecured obligation of unfunded deferred compensation plan	$ 353,000	$ 295,000