Investment Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 114,361	$ 1,622
Debt Securities, Available-for-sale	114,454	1,632
Investment Securities, Amortized Cost Basis	403,383	205,593
Investment Securities, Accumulated Gross Unrealized Gain, before Tax	5,047	1,366
Investment Securities, Accumulated Gross Unrealized Loss, before Tax	191	2,332
Investment Securities	408,239	204,627
Certificates of Deposit, at Carrying Value	211,861	100,000
Investment Securities and Certificates of Deposit	620,100	304,627
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	114,361	1,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	93	10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	114,454	1,632
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	666	666
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	188	410
Equity Securities, FV-NI	478	256
Debt Securities Carried by Broker-Dealers [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	1,500	954
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	3	0
Debt Securities, Trading, Amortized Cost	228,184	147,009
Debt Securities, Trading	229,681	147,963
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	60,172	56,296
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	3,454	402
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	1,922
Equity Securities, FV-NI	$ 63,626	$ 54,776

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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- Definition

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

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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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