Employee Benefit Plan Employee Benefit Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum annual contribution	15.00%
Vesting percentage of employer contribution	100.00%
Costs recognized | $	$ 96	$ 92	$ 94
Number of participants | employee	152
Up To 3%
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution, percent match on employee contribution	100.00%
Employer matching contribution on salary of employee	3.00%
3% to 3.99%
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution, percent match on employee contribution	3.00%
3% to 3.99% | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution on salary of employee	3.00%
3% to 3.99% | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution on salary of employee	3.99%
4% to 4.99%
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution, percent match on employee contribution	3.50%
4% to 4.99% | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution on salary of employee	4.00%
4% to 4.99% | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution on salary of employee	4.99%
5% Or More
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution, percent match on employee contribution	4.00%
Employer matching contribution on salary of employee	5.00%