Fair Value Measurements Fair Value Measurements, Financial Instruments Measured On a Recurring Basis, Quantitative Information (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Par Value	$ 10,970		$ 18,695		$ 45,470
Fair Value Inputs, Asset, Amortized Cost	10,904		18,624		39,391	[1]
Fair Value Inputs, Asset, Fair Value	10,193		17,805		39,671
Fair Value Measurements, Valuation Techniques	Discounted cash flows	[2]	Discounted cash flows	[2]
Fair Value Measurements, Significant Unobservable Input	Interest rate spread		Interest rate spread
Fair Value Inputs, Assets, Discount Rate, Minimum	4.93%	[3]	4.97%	[4]
Fair Value Inputs, Assets, Discount Rate, Maximum	5.23%	[3]	5.27%	[4]
Fair Value Inputs, Assets, Discount Rate, Weighted Average	5.19%	[3]	5.16%	[4]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum	92.68%	[5]	95.02%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum	94.32%	[5]	95.50%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average	93.13%	[5]	95.24%	[5]
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum	482		467
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum	514		518
Additional Decrease in Fair Value From a 100 Basis Point Increase in Interest Rate Spread	(147)
Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | External Credit Rating, Investment Grade [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Par Value					21,545
Fair Value Inputs, Asset, Amortized Cost					21,467	[1]
Fair Value Inputs, Asset, Fair Value					20,531
Fair Value Measurements, Valuation Techniques					Discounted cash flows	[2]
Fair Value Measurements, Significant Unobservable Input					Interest rate spread
Fair Value Inputs, Assets, Discount Rate, Minimum					4.98%	[6]
Fair Value Inputs, Assets, Discount Rate, Maximum					5.28%	[6]
Fair Value Inputs, Assets, Discount Rate, Weighted Average					5.15%	[6]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum					95.02%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum					95.55%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average					95.29%	[5]
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum					462
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum					517
Available-for-sale Securities [Member] | Municipal and other tax-exempt securities [Member] | External Credit Rating, Non Investment Grade [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Par Value					23,925
Fair Value Inputs, Asset, Amortized Cost					17,924	[1]
Fair Value Inputs, Asset, Fair Value					19,140
Fair Value Measurements, Valuation Techniques					Proposed settlement agreement	[2]
Fair Value Measurements, Significant Unobservable Input					Discount for settlement uncertainty
Fair Value Inputs, Assets, Discount Rate, Minimum					0.00%	[7]
Fair Value Inputs, Assets, Discount Rate, Maximum					0.00%	[7]
Fair Value Inputs, Assets, Discount Rate, Weighted Average					0.00%	[7]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum					80.00%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum					80.00%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average					80.00%	[5]
Available-for-sale Securities [Member] | Other debt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Par Value	4,400		4,900		4,900
Fair Value Inputs, Asset, Amortized Cost	4,400		4,900		4,900	[1]
Fair Value Inputs, Asset, Fair Value	4,150		4,712		4,712
Fair Value Measurements, Valuation Techniques	Discounted cash flows	[2]	Discounted cash flows	[2]	Discounted cash flows	[2]
Fair Value Measurements, Significant Unobservable Input	Interest rate spread		Interest rate spread		Interest rate spread
Fair Value Inputs, Assets, Discount Rate, Minimum	5.61%	[8]	5.67%	[8]	5.60%	[8]
Fair Value Inputs, Assets, Discount Rate, Maximum	5.65%	[8]	5.67%	[8]	5.68%	[8]
Fair Value Inputs, Assets, Discount Rate, Weighted Average	5.65%	[8]	5.67%	[8]	5.67%	[8]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum	92.68%	[5]	96.16%	[5]	96.16%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum	92.99%	[5]	96.16%	[5]	96.16%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average	92.80%	[5]	96.16%	[5]	96.16%	[5]
Average Yields On Comparable Short-term Taxable Securities Maximum	1.00%		1.00%		1.00%
Additional Decrease in Fair Value From a 100 Basis Point Increase in Interest Rate Spread	(59)
Available-for-sale Securities [Member] | Equity securities and mutual funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Amortized Cost			2,420		2,420
Fair Value Inputs, Asset, Fair Value			4,207		4,207
Fair Value Measurements, Valuation Techniques			Publicly announced preliminary purchase price information from acquirer		Publicly announced preliminary purchase price information from acquirer.
Fair Value Measurements, Significant Unobservable Input			Discount for settlement uncertainty		Discount for settlement uncertainty
Residential Mortgage Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Amortized Cost	7,764
Fair Value Inputs, Asset, Fair Value	7,376
Fair Value Measurements, Valuation Techniques	Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
Fair Value Measurements, Significant Unobservable Input	Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies.
Other assets - private equity funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Fair Value	$ 27,118		$ 27,341		$ 27,799
Fair Value Measurements, Valuation Techniques	Net asset value reported by underlying fund		Net asset value reported by underlying fund		Net asset value reported by underlying fund
Fair Value Measurements, Significant Unobservable Input	Net asset value reported by underlying fund		Net asset value reported by underlying fund		Net asset value reported by underlying fund

[1] Amortized cost reduced by other-than-temporary impairments recorded in earnings. See Note 2 for additional discussion.

[2] Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume

[3] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 482 to 514 basis points over average yields for comparable tax-exempt securities.

[4] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 467 to 518 basis points over average yields for comparable tax-exempt securities.

[5] Represents fair value as a percentage of par value.

[6] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 462 to 517 basis points over average yields for comparable tax-exempt securities.

[7] Fair value based on proposed settlement agreement between bond holders and issuer.

[8] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 1%.