Fair Value Of Financial Instruments (Quantitative Information related To The Significant Unobservable Inputs Utilized In Company's Level 3 Recurring Fair Value Measurements) (Details)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Discounted Cash Flow [Member] | State And Municipal Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range, low end	6.00%
Discount rate range, high end	11.50%
Discount rate, weighted average	8.40%	8.40%
Workout period range, low end	3 years
Workout period range, high end	4 years
Weighted average workout period	3 years 10 months 24 days
Discounted Cash Flow [Member] | Auction Rate Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range, low end	2.10%
Discount rate, weighted average	7.30%	7.30%
Workout period range, low end	1 year
Workout period range, high end	3 years
Weighted average workout period	2 years 4 months 24 days
Discounted Cash Flow [Member] | Auction Rate Municipal Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range, low end	0.20%
Discount rate range, high end	8.60%
Discount rate, weighted average	6.60%	6.60%
Workout period range, low end	1 year
Workout period range, high end	4 years
Weighted average workout period	2 years 9 months 18 days
Minimum [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	1.3
EBITDA multiple	4.1
Minimum [Member] | Market / Income Approach [Member] | Private Equity Investments [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	0.5
EBITDA multiple	4.3
Maximum [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	4.2
EBITDA multiple	15.3
Maximum [Member] | Market / Income Approach [Member] | Private Equity Investments [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	2.0
EBITDA multiple	9.8
Weighted Average [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	3.3
EBITDA multiple	8.7
Weighted Average [Member] | Market Approach [Member] | Private Equity Investments [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	1.4
EBITDA multiple	6.7