Benefit Plans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net periodic benefit cost for both the Executive Retirement Plan and the Outside Director Plan
Service cost		$ 29	$ 88	$ 86
Interest cost		225	687	597
Amortization of prior service cost (benefit)		(198)	(1,189)	(1,189)
Amortization of net gain (loss)		343	469	1,380
Total		399	55	874
Net (gain) loss recognized in Accumulated other comprehensive income (loss)			2,570	(2,143)
Total recognized in net periodic benefit gain and Accumulated other comprehensive income (loss) (1)	[1]	$ 399	$ 2,625	$ (1,269)

[1] 2015 is a partial year due to the termination of the Executive Retirement Plan.