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LOAN PORTFOLIO - Corporation's Commercial Credit Exposure (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net	$ 33,630	$ 43,186
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net	0	1,725
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net	0	3,015
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net	7,144	11,371
Nonperforming Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net	$ 7,100	16,100
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net		1,700
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net		3,000
Nonperforming Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Loans Receivable Held For Sale Net		$ 11,400

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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