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LOAN PORTFOLIO - Corporation's TDR Activity (Parenthetical) (Detail) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable Modifications [Line Items] |  |
Loans held for investment transferred to held for sale | $ 10,114 | $ 69,851
TDR [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Charge Offs Loans Held For Sale |  | 5,100
Loans held for investment transferred to held for sale |  | $ 30,000

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