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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LOSSES - Activity in ACL on loans and finance leases (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]        
Provision (release) for credit losses   $ 168,717 $ 40,225 $ 59,253
Loans held for investment transferred to held for sale   $ 10,817 $ 24,470 90,319
Non-PCD | Santander [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Provision (release) for credit losses $ 37,500      
Nonperforming Financial Instruments [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans held for investment transferred to held for sale       74,400
Charge Offs Loans Held For Sale       22,200
Charge Offs Loans Held For Sale Previously Established Reserve       6,500
Provision Loans Transferred To Held For Sale       $ 15,700