Benefit Plans - Deferred Compensation Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) director	Dec. 31, 2014 USD ($)
Deferred Compensation Plan
Maximum percentage of board fees deferred by participating director into deferred account	100.00%
Maximum term of distribution schedule elected by director	10 years
Deferred compensation obligation | $	$ 20	$ 50
Number of former directors for whom life insurance policies purchased | director	1
Term for commencement of disbursement of deferred fees after death of director	1 month