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
	Jun. 30, 2014		Dec. 31, 2013		Jun. 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	10,903		18,624		40,759	[1]
Fair Value Inputs, Asset, Fair Value	10,445		17,805		38,847
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	4.91%	[3]	4.97%	[4]
Fair Value Inputs, Assets, Discount Rate, Maximum	5.21%	[3]	5.27%	[4]
Fair Value Inputs, Assets, Discount Rate, Weighted Average	5.17%	[3]	5.16%	[4]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum	95.11%	[5]	95.02%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum	96.13%	[5]	95.50%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average	95.38%	[5]	95.24%	[5]
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum	480		467
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum	508		518
Additional Decrease in Fair Value From a 100 Basis Point Increase in Interest Rate Spread	(101)
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					28,470
Fair Value Inputs, Asset, Amortized Cost					28,375	[1]
Fair Value Inputs, Asset, Fair Value					27,116
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					4.99%	[6]
Fair Value Inputs, Assets, Discount Rate, Maximum					5.49%	[6]
Fair Value Inputs, Assets, Discount Rate, Weighted Average					5.24%	[6]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum					95.01%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum					95.60%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average					95.25%	[5]
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum					457
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum					520
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					17,000
Fair Value Inputs, Asset, Amortized Cost					12,384	[1]
Fair Value Inputs, Asset, Fair Value					11,731
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					9.15%	[7]
Fair Value Inputs, Assets, Discount Rate, Maximum					11.19%	[7]
Fair Value Inputs, Assets, Discount Rate, Weighted Average					9.87%	[7]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum					68.91%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum					69.09%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average					69.01%	[5]
Below Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities					700
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		5,400
Fair Value Inputs, Asset, Amortized Cost	4,400		4,900		5,400	[1]
Fair Value Inputs, Asset, Fair Value	4,231		4,712		5,193
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	4.38%	[8]	5.67%	[8]	4.41%	[8]
Fair Value Inputs, Assets, Discount Rate, Maximum	5.65%	[8]	5.67%	[8]	5.69%	[8]
Fair Value Inputs, Assets, Discount Rate, Weighted Average	5.51%	[8]	5.67%	[8]	5.48%	[8]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum	95.11%	[5]	96.16%	[5]	96.13%	[5]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum	95.28%	[5]	96.16%	[5]	96.16%	[5]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average	95.17%	[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	(41)
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		2,247
Fair Value Measurements, Valuation Techniques			Publicly announced preliminary purchase price information from acquirer.		Tangible book value per share of publicly traded financial institutions of similar size, less liquidity discount.
Fair Value Measurements, Significant Unobservable Input			Discount for settlement uncertainty.		Peer group tangible book per share and liquidity discount.
Fair Value Inputs, Assets, Liquidity Discount					20.00%
Other assets - private equity funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Asset, Fair Value	$ 27,834		$ 27,341		$ 28,379
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 480 to 508 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 457 to 520 basis points over average yields for comparable tax-exempt securities.

[7] Interest rate yields determined using a spread of 700 basis points over comparable municipal securities of varying durations.

[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%.