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Notes Payable and Subordinated Borrowings - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Aug. 01, 2019	Dec. 31, 2018	Mar. 30, 2016
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.16%
Carrying Value	$ 37,873		$ 37,776
Series B Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.44%
Carrying Value	$ 66,581		66,466
Series C Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.64%
Carrying Value	$ 47,595		47,542
Series D Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.72%
Carrying Value	$ 16,842		16,828
Series E Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.46%
Carrying Value	$ 74,282		0
Series F Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.55%
Carrying Value	$ 59,422		0
Series G Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.64%
Carrying Value	$ 39,613		0
Series H Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	3.42%
Carrying Value	$ 32,854		0
Senior Notes [Member]
Debt Instrument [Line Items]
Carrying Value	$ 375,062		$ 168,612
Parent Company [Member] \| Series A Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.88%
Parent Company [Member] \| Series B Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.23%
Parent Company [Member] \| Series C Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.48%
Parent Company [Member] \| Series D Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.58%
Parent Company [Member] \| Series E Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.34%
Parent Company [Member] \| Series F Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.44%
Parent Company [Member] \| Series G Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.54%
Parent Company [Member] \| Series H Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.33%