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LOAN PORTFOLIO - Consumer Credit Exposure (Parenthetical) (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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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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