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Investment Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 452,955	$ 402,824
Debt Securities, Available-for-sale	452,974	402,863
Investment Securities, Amortized Cost Basis	1,128,704	1,041,104
Investment Securities, Accumulated Gross Unrealized Gain, before Tax	26,747	19,808
Investment Securities, Accumulated Gross Unrealized Loss, before Tax	2	76
Investment Securities	1,155,449	1,060,836
Certificates of Deposit, at Carrying Value	114,512	0
Investment Securities and Certificates of Deposit	1,269,961	1,060,836
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	452,955	402,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19	39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	452,974	402,863
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	376	0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	73
Equity Securities, FV-NI	1,042	593
Debt Securities Carried by Broker-Dealers [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	42	27
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	2	3
Debt Securities, Trading, Amortized Cost	564,837	550,002
Debt Securities, Trading	564,877	550,026
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	110,246	87,612
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	26,310	19,742
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	$ 136,556	$ 107,354

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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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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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