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LOAN PORTFOLIO - Corporation's Credit Quality Indicators by Loan (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans $ 1,601,638 $ 1,568,808
Commercial and Industrial loans 2,144,236 2,180,455
Land 29,953 31,766
Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 7,930 15,710
Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 91,577 77,475
Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 158,960 193,391
Commercial and Industrial loans 142,800 133,599
Land 18,753 19,345
Substandard [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 701 1,933
Substandard [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 35,520 36,893
Doubtful [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 6,416 35,416
Commercial and Industrial loans 3,472 67,996
Land 0 0
Doubtful [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Doubtful [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Unlikely To Be Collected Financing Receivable [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 0 0
Commercial and Industrial loans 798 784
Land 0 0
Unlikely To Be Collected Financing Receivable [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Unlikely To Be Collected Financing Receivable [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Total Adversely Classified [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans [1] 165,376 228,807
Commercial and Industrial loans [1] 147,070 202,379
Land [1] 18,753 19,345
Total Adversely Classified [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans [1] 701 1,933
Total Adversely Classified [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans [1] $ 35,520 $ 36,893
[1]
Excludes $8.3 million and $8.1 million of construction-land non-performing loans held for sale as of September 30, 2017 and December 31, 2016, respectively.