Loans - Summary of Nonperforming Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Loans past due over 90 days and still accruing interest	$ 535	$ 1,692
Total nonperforming loans	79,733	38,608
Non-PCD Loans [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	45,305	36,916
Loans past due over 90 days and still accruing interest	535	$ 1,692
PCD Loans [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 33,893