Investment Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 462,544	$ 706,826
Debt Securities, Available-for-sale	462,890	706,847
Investment Securities, Amortized Cost Basis	995,668	1,603,987
Investment Securities, Accumulated Gross Unrealized Gain, before Tax	1,274	39,464
Investment Securities, Accumulated Gross Unrealized Loss, before Tax	9,805	30
Investment Securities	987,137	1,643,421
Certificates of Deposit, at Carrying Value	148,563	141,218
Investment Securities and Certificates of Deposit	1,135,700	1,784,639
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	462,544	706,826
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	346	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	16
Debt Securities, Available-for-sale	462,890	706,847
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	558	666
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	0	193
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	147	0
Equity Securities, FV-NI	411	859
Debt Securities Carried by EGL
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	570	43
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	14
Debt Securities, Trading, Amortized Cost	389,290	784,813
Debt Securities, Trading	389,860	784,842
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	143,276	111,682
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	358	39,191
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	9,658	0
Equity Securities, FV-NI	$ 133,976	$ 150,873

Marketable Securities, Accumulated Gross Unrealized Gain, Before Tax

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Marketable Securities, Accumulated Gross Unrealized Loss, Before Tax

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Marketable Securities, Amortized Cost Basis

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Trading Securities, Accumulated Gross Unrealized Gain, Before Tax

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Trading Securities, Accumulated Gross Unrealized Loss, Before Tax

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of investment in marketable security.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amortized cost of investments in debt securities classified as trading.

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