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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, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 13,060 $ 114,204
Debt Securities, Available-for-sale 13,119 114,784
Investment Securities, Amortized Cost Basis 271,205 399,301
Investment Securities, Accumulated Gross Unrealized Gain, before Tax 1,317 10,048
Investment Securities, Accumulated Gross Unrealized Loss, before Tax 10,862 199
Investment Securities 261,660 409,150
Certificates of Deposit, at Carrying Value 0 214,796
Investment Securities and Certificates of Deposit 261,660 623,946
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 13,060 114,204
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 101 591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 42 11
Debt Securities, Available-for-sale 13,119 114,784
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 502 168
Equity Securities, FV-NI 164 498
Debt Securities Carried by Broker-Dealers [Member]    
Debt Securities, Available-for-sale [Line Items]    
Trading Securities, Accumulated Gross Unrealized Gain, before Tax 1,216 1,648
Trading Securities, Accumulated Gross Unrealized Loss, before Tax 1,282 20
Debt Securities, Trading, Amortized Cost 199,222 225,727
Debt Securities, Trading 199,156 227,355
Investment Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Equity Securities, FV-NI, Cost 58,257 58,704
Trading Securities, Accumulated Gross Unrealized Gain, before Tax 0 7,809
Trading Securities, Accumulated Gross Unrealized Loss, before Tax 9,036 0
Equity Securities, FV-NI $ 49,221 $ 66,513