Accounting Policies Recently Adopted and Pending Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Increase to allowance for credit loss on off-balance sheet credit exposures		$ 0	$ 29,638
ASU 2016-13 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Decrease to loans held for investment, allowance for credit loss	$ 3,000
Increase to allowance for credit loss on off-balance sheet credit exposures	29,600
One-time cumulative effect adjustment through retained earnings, before tax	26,600
One-time cumulative effect adjustment through retained earnings, net of tax	$ 19,900