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LOANS HELD FOR INVESTMENT - Breakdown Between Accrual and Nonaccrual Status of TDRs (Parenthetical) (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
TDR [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans forced to nonaccrual status $ 16.3 $ 14.8