Fair Value Measurements - Summary of Difference Between Aggregate Fair Value and Remaining Contractual Principal Outstanding for Financial Instruments for which Fair Value Option has been Elected (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Loans held for sale, unpaid principal balance	$ 220,190	$ 493,340
Loans held for sale, fair value	220,689	504,416
Loans held for sale, fair value over/(under) unpaid principal balance	$ 499	$ 11,076