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Net realized and unrealized gains (losses) on private equity fund investments, including performance fees

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Number of Dirctors

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Previously received carried interest subject to repayment.

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Unfunded commitments for capital contributions

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity security without readily determinable fair value.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The number of limited partner units issued.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Investments - Additional Information (Details)		3 Months Ended		9 Months Ended
Investments - Additional Information (Details)	Jul. 07, 2021 USD ($) director	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2010 USD ($) shares
Schedule of Investments [Line Items]
Income from Equity Method Investments		$ 3,681,000	$ 3,111,000	$ 10,099,000	$ 8,552,000
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments		(460,000)	697,000	(438,000)	(1,646,000)
Previously Received Carried Interest Subject to Repayment		785,000		785,000
Total Assets		3,271,888,000	$ 2,645,458,000	3,271,888,000	$ 2,645,458,000	$ 3,370,888,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		$ 5,980,000		$ 5,980,000		5,572,000
Issued LP Units (in shares) \| shares		0	0	0	0
Unfunded Commitments for Capital Contributions		$ 8,533,000		$ 8,533,000
Special Charges, Including Business Realignment Costs		8,554,000	$ 7,380,000	8,554,000	$ 39,614,000
Equity Securities without Readily Determinable Fair Value, Amount		673,000		673,000		683,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Total Assets		3,617,000		3,617,000		3,083,000
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Amortization of Intangible Assets		$ 79,000	79,000	$ 237,000	237,000
ABS [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage		46.00%		46.00%
Income from Equity Method Investments		$ 2,234,000	1,917,000	$ 6,724,000	5,740,000
Atalanta Sosnoff [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage		49.00%		49.00%
Income from Equity Method Investments		$ 883,000	624,000	$ 2,093,000	1,641,000
Luminis [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage		20.00%		20.00%
Income from Equity Method Investments		$ 564,000	$ 570,000	$ 1,282,000	$ 1,171,000
Seneca Evercore [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Payments to Acquire Equity Method Investments	$ 500,000
Number of Directors \| director	1
G5 [Member]
Schedule of Investments [Line Items]
Debt Securities, Held-to-maturity						7,385,000
G5 [Member] \| Other Income
Schedule of Investments [Line Items]
Debt Securities, Gain (Loss)				4,374,000
Trilantic [Member]
Schedule of Investments [Line Items]
Issued LP Units (in shares) \| shares							500,000
Limited Partnership Investment							$ 16,090,000
Trilantic V [Member]
Schedule of Investments [Line Items]
Capital Commitment		5,000,000		5,000,000
Unfunded Commitments for Capital Contributions		348,000		348,000
Trilantic VI [Member]
Schedule of Investments [Line Items]
Capital Commitment		12,000,000		12,000,000
Unfunded Commitments for Capital Contributions		5,762,000		5,762,000
Glisco [Member]
Schedule of Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount		$ 221,000		$ 221,000		$ 387,000