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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