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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in Allowance for Loan and Lease Losses (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]    
Loans held for investment transferred to held for sale $ 1,775 $ 67,937
Nonperforming Financing Receivable [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Loans held for investment transferred to held for sale   57,200
Charge Offs Loans Held For Sale   9,700
Nonperforming Financing Receivable [Member] | Loans Tranferred To Held For Sale [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Loans held for investment transferred to held for sale   57,200
Charge Offs Loans Held For Sale   9,700
Charge Offs Loans Held For Sale Previously Established Reserve   4,100
Provision Loans Transferred To Held For Sale   5,600
Nonperforming Financing Receivable [Member] | Loans Tranferred To Held For Sale [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Loans held for investment transferred to held for sale   27,200
Charge Offs Loans Held For Sale   4,600
Nonperforming Financing Receivable [Member] | Loans Tranferred To Held For Sale [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Loans held for investment transferred to held for sale   30,000
Charge Offs Loans Held For Sale   $ 5,100