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Employee Benefit Plans (Details 4)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
DB Pension Plan
Discount Rates
Benefit Cost for Plan Year	4.05%	3.81%	4.76%
Benefit Obligation at End of Plan Year	3.89%	4.05%	3.81%
Expected long-term return on plan assets	7.25%	7.25%	7.25%
Rate of compensation increase
Benefit Cost for Plan Year		5.00%	5.00%
Benefit Obligation at End of Plan Year		5.00%	5.00%
Life and Healthcare Plan
Discount Rates
Benefit Cost for Plan Year	4.14%	3.80%	4.70%
Benefit Obligation at End of Plan Year	3.97%	4.14%	3.80%
Rate of compensation increase
Benefit Cost for Plan Year	5.00%	5.00%	5.00%
Benefit Obligation at End of Plan Year	5.00%	5.00%	5.00%
SERPs
Discount Rates
Benefit Cost for Plan Year	4.32%	4.00%	5.00%
Benefit Obligation at End of Plan Year	4.10%	4.32%	4.00%
Rate of compensation increase
Benefit Cost for Plan Year	5.00%	5.00%	5.00%
Benefit Obligation at End of Plan Year	5.00%	5.00%	5.00%

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The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Expected rate of compensation increases (for pay-related plans).

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

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Expected rate of compensation increases (for pay-related plans).

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