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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
Mar. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Loans held for sale, unpaid principal balance $ 485,206 $ 375,274
Loans held for sale, fair value 495,932 384,375
Loans held for sale, fair value over/(under) unpaid principal balance $ 10,726 $ 9,101