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Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Apr. 12, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value	$ 1,036,782,000	$ 735,393,000
Auction rate securities, firm purchased and hold	87,100,000
Amount of ARS committed to purchase from clients	32,500,000
Valuation adjustment (unrealized loss) for ARS	$ 1,959,000
Interest rate	8.75%		8.75%
Loans held for sale period (in days)	60 days
Maximum period held for sale (in days)	90 days
Book value of loan held for sale	$ 12,700,000
Mortgages Held-for-sale, Fair Value Disclosure	13,532,000
Loans held for sale	$ 13,532,000	60,234,000
Forward or delayed delivery of the underlying instrument with settlement (in days)	180 days
Maximum [Member] | LIBOR or Treasury Yield [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Auction market preferred securities variable interest rate earned	200.00%
Auction Rate Securities [Member] | Fair Value, Valuation Scenario Two [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in discount rate	50.00%
Decrease in fair value of ARS	$ 2,200,000
Auction Rate Securities [Member] | Fair Value, Valuation Scenario One [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in discount rate	25.00%
Decrease in fair value of ARS	$ 1,100,000
Auction Rate Securities [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commitment to purchase ARS period maximum	2020
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Permanent and construction loans , discount rate	12.00%
Continuous prepayment rate used up to loans prepayment penalty rate hit 4%	0.00%
Continuous prepayment rate	4.00%
Continuous prepayment rate vast majority range minimum	10.00%
Continuous prepayment rate vast majority range maximum	15.00%
Continuous prepayment rate vast majority range average rate	12.00%
Estimated future cost to service loans on an annual basis per loan, average	$ 1,250
Auction Rate Securities Purchase Commitment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	(981,000)
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	(1,540,000)
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities 01 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	$ 559,000
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Permanent and construction loans , discount rate	1.56%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities 01 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Permanent and construction loans , discount rate	1.56%
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value	$ 44,964,000	34,475,000
Auction Rate Securities Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	2,940,000
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	$ 2,406,000
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Permanent and construction loans , discount rate	1.56%
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value	$ 13,500,000	$ 14,000,000

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Estimated future cost to service loans on annual basis per loan average.

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Securities committed to purchase period.

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Valuation adjustment for the level 3 assets used for quantitative disclosure.

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The interest (or dividend) rates earned on action market preferred securities (on an annual basis or APY) for the period reported.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Number 210
-Section 02
-Paragraph 29
-Article 5

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Contractual interest rate for funds borrowed, under the debt agreement.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

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The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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