Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net periodic benefit cost for both the Executive Retirement Plan and the Outside Director Plan
Service cost	$ 0	$ 29	$ 88
Interest cost	$ 0	225	687
Amortization of prior service cost (benefit)		(198)	(1,189)
Amortization of net gain (loss)		343	469
Total		399	55
Net loss recognized in Accumulated other comprehensive income (loss)			2,570
Total recognized in net periodic benefit gain and Accumulated other comprehensive income (loss) (1)		$ 399	$ 2,625