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LOAN PORTFOLIO - Corporation's Commercial Credit Exposure (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross $ 9,113,955 $ 8,858,123 $ 8,640,291
Commercial Portfolio Segment [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 3,930,293 3,750,202  
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,550,364 1,522,662 1,533,308
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 2,279,685 2,148,111 2,009,049
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 100,244 79,429 $ 84,683
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 12,128 11,151  
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 68,936 47,965  
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 19,180 20,313  
Special Mention [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 126,766 172,260  
Special Mention [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 16,760 85,557  
Special Mention [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Special Mention [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Special Mention [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Substandard [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 240,624 276,935  
Substandard [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 34,874 45,274  
Substandard [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,337 2,102  
Substandard [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Substandard [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 6,648 7,407  
Doubtful [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,533 1,701  
Doubtful [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 2,563 6,114  
Doubtful [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Doubtful [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Doubtful [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Loss [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Loss [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 241 396  
Loss [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Loss [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Loss [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Total Criticized Asset [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 368,923 450,896  
Total Criticized Asset [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 54,438 137,341  
Total Criticized Asset [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,337 2,102  
Total Criticized Asset [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 0 0  
Total Criticized Asset [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]      
Financing Receivable Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross $ 6,648 $ 7,407