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LOAN PORTFOLIO - Corporation's Commercial Credit Exposure (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans $ 1,506,502 $ 1,614,972
Land 21,304 26,931
Commercial and Industrial loans 2,068,256 2,083,253
Construction-commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 53,970 76,556
Construction-residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 7,588 7,910
Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 262,519 257,503
Land 5,658 15,971
Commercial and Industrial loans 96,993 154,416
Substandard [Member] | Construction-commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 3,458 35,100
Substandard [Member] | Construction-residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 1,194 1,987
Doubtful [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 7,927 4,166
Land 0 490
Commercial and Industrial loans 4,659 3,854
Doubtful [Member] | Construction-commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Doubtful [Member] | Construction-residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Loss [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 0 0
Land 0 0
Commercial and Industrial loans 394 676
Loss [Member] | Construction-commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0 0
Loss [Member] | Construction-residential [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] 270,446 261,669
Land [1] 5,658 16,461
Commercial and Industrial loans [1] 102,046 158,946
Total Adversely Classified [Member] | Construction-commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans [1] 3,458 35,100
Total Adversely Classified [Member] | Construction-residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans [1] $ 1,194 $ 1,987
[1]
Excludes non-performing loans held for sale of $44.2 million ($12.4 million commercial mortgage, $30.0 million construction-commercial, and $1.8 million construction-land) and $8.3 million (construction-land) as of September 30, 2018 and December 31, 2017, respectively.