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Investment Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 147,995 | $ 402,824
Debt Securities, Available-for-sale | 147,996 | 402,863
Investment Securities, Amortized Cost Basis | 779,853 | 1,041,104
Investment Securities, Accumulated Gross Unrealized Gain, before Tax | 19,388 | 19,808
Investment Securities, Accumulated Gross Unrealized Loss, before Tax | 1 | 76
Investment Securities | 799,240 | 1,060,836
Certificates of Deposit, at Carrying Value | 73,877 | 0
Investment Securities and Certificates of Deposit | 873,117 | 1,060,836
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 147,995 | 402,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 147,996 | 402,863
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Cost | 2,621 | 666
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 2,055 | 0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 73
Equity Securities, FV-NI | 4,676 | 593
Debt Securities Carried by Broker-Dealers [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 19 | 27
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 1 | 3
Debt Securities, Trading, Amortized Cost | 519,969 | 550,002
Debt Securities, Trading | 519,987 | 550,026
Investment Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Cost | 109,268 | 87,612
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 17,313 | 19,742
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Equity Securities, FV-NI | $ 126,581 | $ 107,354

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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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