Fair Value Disclosures - Additional Information (Details)		9 Months Ended
	Jun. 02, 2018 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, fair value disclosure		$ 0	$ 0
Minimum | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Selling and closing costs for loans as a percentage of appraised value		5.00%
Maximum | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Selling and closing costs for loans as a percentage of appraised value		8.00%
Interstate Capital Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration earnout period	30 months
Final contingent consideration payout		$ 22,000,000	$ 22,000,000
Interstate Capital Corporation | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Final contingent consideration payout	$ 0
Interstate Capital Corporation | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Final contingent consideration payout	$ 22,000,000
Measurement Input Discount Rate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification asset, discount rate		0.04
Measurement Input Discount Rate | Interstate Capital Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value, discount rate		0.002	0.017
Measurement Input, Appraised Value | Minimum | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate selling and closing costs, percentage of appraised value		0.05
Measurement Input, Appraised Value | Maximum | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate selling and closing costs, percentage of appraised value		0.08