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Investment Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 402,824 | $ 114,204
Debt Securities, Available-for-sale | 402,863 | 114,784
Investment Securities, Amortized Cost Basis | 1,041,104 | 399,301
Investment Securities, Accumulated Gross Unrealized Gain, before Tax | 19,808 | 10,048
Investment Securities, Accumulated Gross Unrealized Loss, before Tax | 76 | 199
Investment Securities | 1,060,836 | 409,150
Certificates of Deposit, at Carrying Value | 0 | 214,796
Investment Securities and Certificates of Deposit | 1,060,836 | 623,946
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 402,824 | 114,204
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 39 | 591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 11
Debt Securities, Available-for-sale | 402,863 | 114,784
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 | 73 | 168
Equity Securities, FV-NI | 593 | 498
Debt Securities Carried by Broker-Dealers [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 27 | 1,648
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 3 | 20
Debt Securities, Trading, Amortized Cost | 550,002 | 225,727
Debt Securities, Trading | 550,026 | 227,355
Investment Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Cost | 87,612 | 58,704
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 19,742 | 7,809
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Equity Securities, FV-NI | $ 107,354 | $ 66,513

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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 Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + 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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