Employee Benefit And Stock Compensation Plans - Schedule Of Stock Option Valuation Assumptions (Details) - Options	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value assumptions
Risk-free interest rate	1.38%	1.38%	1.38%
Expected dividend yield	1.47%	1.36%	1.27%
Expected volatility	28.61%	33.15%	40.34%
Expected life (years)	3 years 10 months 24 days	4 years	3 years 10 months 24 days
Minimum
Fair value assumptions
Risk-free interest rate	0.87%	0.99%	0.79%
Expected dividend yield	1.27%	1.25%	1.05%
Expected volatility	25.92%	25.90%	29.38%
Maximum
Fair value assumptions
Risk-free interest rate	1.99%	1.84%	1.82%
Expected dividend yield	1.66%	1.41%	1.49%
Expected volatility	34.27%	37.65%	52.50%