Other Liabilities (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Aug. 29, 2014
Other Liabilities [Line Items]
Accrued pension costs	$ 5,354,000		$ 5,354,000		$ 5,732,000	$ 7,500,000
Service cost	0	$ 0	0	$ 0
Interest cost	45,000	45,000	135,000	135,000
Actuarial loss (gain)	52,000	$ 52,000	155,000	$ 116,000
Benefit obligation	$ 10,200,000		$ 10,200,000
Discount rate	4.25%		4.25%
Discount term			15 years
Monthly estate payment amount	$ 57,000		$ 57,000
Discounted value	2,700,000		2,700,000
Accumulated prior service cost	3,100,000		$ 3,100,000
Accumulated prior service cost amortization period			15 years
Accrued pension costs included in other liabilities	$ 8,100,000		$ 8,100,000
Supplemental Executive Retirement Plans [Member]
Other Liabilities [Line Items]
Accrued pension costs						$ 7,600,000