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LOAN PORTFOLIO - Corporation's Credit Quality Indicators by Loan (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |
Commercial mortgage loans |  | $ 1,614,972 | $ 1,568,808
Commercial and Industrial loans |  | 2,083,253 | 2,180,455
Land |  | 26,931 | 31,766
Residential Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans |  | 7,910 | 15,710
Commercial Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans |  | 76,556 | 77,475
Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Commercial mortgage loans |  | 257,503 | 193,391
Commercial and Industrial loans |  | 154,416 | 133,599
Land |  | 15,971 | 19,345
Substandard [Member] | Residential Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans |  | 1,987 | 1,933
Substandard [Member] | Commercial Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans |  | 35,100 | 36,893
Doubtful [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Commercial mortgage loans |  | 4,166 | 35,416
Commercial and Industrial loans |  | 3,854 | 67,996
Land |  | 490 | 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 |  | 676 | 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] | 261,669 | 228,807
Commercial and Industrial loans | [1] | 158,946 | 202,379
Land | [1] | 16,461 | 19,345
Total Adversely Classified [Member] | Residential Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans | [1] | 1,987 | 1,933
Total Adversely Classified [Member] | Commercial Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Construction loans | [1] | $ 35,100 | $ 36,893
[1] | Excludes $8.3 million and $8.1 million of non-performing loans held for sale as of December 31, 2017 and 2016, respectively.

X
- 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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