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LOAN PORTFOLIO-Corporation's Aging of Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage	$ 224.0	$ 142.8
Residential Mortgage [Member] | Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage	28.1	22.3
Commercial Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage	9.0	4.6
Commercial Mortgage [Member] | Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage	$ 0.2	$ 0.1

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- Definition

Represents the amount of Mortgage related loans that are past due more than 29 days but less than 60. According to the Corporation's deinquency policy and consitent with the instructions for the prepartion of the Consolidated Financial Statements for Bank Holding Companies (FR Y-9C) required by the Federal Reserve, rediential mortgages, commercial mortgages and construction loans are considered past due when the borrower is in arreas two or more monthly payments.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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