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LOAN PORTFOLIO - Consumer Credit Exposure (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 90 Days Past Due And Still Accruing	$ 114,744	$ 129,083
Loans Insured or Guaranteed by US Government Authorities [Member] | Residential Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 90 Days Past Due And Still Accruing	89,687	104,751
Loans Insured or Guaranteed by US Government Authorities [Member] | Nonaccrual Of Interest [Member] | Residential Portfolio Segment [Member] | Financing Receivables 30 To 59 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 90 Days Past Due And Still Accruing	$ 39,800	$ 51,400
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest	15 months	15 months

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Period of residential mortgage loan that are no longer accruing interest.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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