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LOAN PORTFOLIO - Selected Information on TDRs Includes Recorded Investment by Loan Class and Modification Type (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net $ 33,630 $ 43,186
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net 0 1,725
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net 7,144 11,371
Nonaccrual [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net 7,100 16,100
Nonaccrual [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net   1,700
Nonaccrual [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net   11,400
TDR [Member] | Nonaccrual [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net   900
TDR [Member] | Nonaccrual [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Modifications [Line Items]    
Loans Receivable Held For Sale Net $ 7,100 $ 11,100