Affordable Housing Projects Tax Credit Partnerships - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Assets	$ 11,117,802	$ 8,988,719
Unfunded commitments	8,762
Other Liabilities
Schedule of Equity Method Investments [Line Items]
Unfunded commitments	8,800
Affordable Housing Projects Tax Credit Partnership | Other Assets
Schedule of Equity Method Investments [Line Items]
Assets	$ 26,100