Loans - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Purchases of loans held for sale	$ 59,200,000	$ 59,150,000	$ 0	$ 25,000,000
Proceeds from the sale of loans held for sale	15,000,000.0	15,000,000	0	25,000,000
Held for sale loans reclassified to loans held for investment	44,200,000	44,150,000	0	$ 0
Loans held for sale, at lower of cost or fair value	$ 0	$ 0	$ 0