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LOANS HELD FOR SALE - Portfolio of Loans Held For Sale (Parenthetical) (Detail) - Nonperforming Financing Receivable [Member] - Loans held for sale sold [Member]
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]  
Financing Receivable Significant Sales $ 4.8
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]  
Accounts Notes And Loans Receivable [Line Items]  
Financing Receivable Significant Sales 1.1
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]  
Accounts Notes And Loans Receivable [Line Items]  
Financing Receivable Significant Sales $ 3.7