Supplemental Compensation Plans, Executive Salary Continuation Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Participant
Salary Continuation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Duration for benefit payment after retirement age	10 years
Retirement age	65 years
Reduced benefit age	55 years
Years of services for reduced benefit	10 years
Salary Continuation Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined annual benefit plan amount	$ 50
Salary Continuation Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined annual benefit plan amount	$ 125
Supplemental Executive Retirement Plan [Member] | Executive [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of participants in SERP plan | Participant	3
Average years of salary used for benefit calculation	3 years
Average years of bonus used for benefit calculation	7 years
Percentage of average compensation for executive	2.00%
Target service years for executive	25 years
Target benefit of average compensation	50.00%
Reduction made for social security benefit	50.00%
Expected age of social security benefit	65 years
Number of years average yields of treasury securities	3 years
Treasury securities duration	10 years
Period of monthly retirement benefit payment	120 months
Additional months for retirement payment for full year of service	6 months
Number of full service years used to calculate additional retirement payment	10 years
Maximum period for monthly retirement payment	180 months
Reduction in benefit for retirement prior to retirement age	5.00%
Benefit reduction for retirement at age 55	50.00%
Early retirement age	55 years
Benefit payable for voluntary terminations prior to age 55	0.00%
Supplemental Executive Retirement Plan [Member] | Chief Executive Officer [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of average compensation for CEO	2.50%
Target service years for executive	20 years
Directors' Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Duration for benefit payment after retirement age	10 years
Retirement age	65 years
Reduced benefit age	55 years
Years of services for reduced benefit	10 years