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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.

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- Definition Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements. Includes loans to other Finanacial Institutions. + References No definition available. + Details
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- Definition Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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