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LOAN PORTFOLIO - Corporation's Commercial Credit Exposure (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net $ 33,630 $ 43,186
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net 0 1,725
Commercial Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net 0 3,015
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net 7,144 11,371
Nonperforming Financing Receivable [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net $ 7,100 16,100
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net   1,700
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net   3,000
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans Receivable Held For Sale Net   $ 11,400