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LOANS HELD FOR INVESTMENT - Corporation's Nonaccrual Status and Loans 90 Days or More Still Accruing (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 11,777,289 $ 9,002,205  
Financing Receivable, 90 Days or More Past Due, Still Accruing 145,095 135,042  
PR And VI [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 9,788,106 7,128,277  
Financing Receivable, 90 Days or More Past Due, Still Accruing 144,845 134,913  
U S [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,989,183 1,873,928  
Financing Receivable, 90 Days or More Past Due, Still Accruing 250 129  
Residential Portfolio Segment [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,521,954 2,933,773  
Financing Receivable, Purchase 800 18,800 $ 46,100
Residential Portfolio Segment [Member] | PR And VI [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,002,203 2,367,587  
Residential Portfolio Segment [Member] | U S [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 519,751 566,186  
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, 90 Days or More Past Due, Still Accruing 10,700 35,300  
Financing Receivable, Purchase 55,000 33,500 $ 49,100
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | PR And VI [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, 90 Days or More Past Due, Still Accruing 10,700 35,300  
Financing Receivable, Purchase 55,000    
PCD loans [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 130,900 136,700  
PCD loans [Member] | PR And VI [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, before Allowance for Credit Loss 130,900 136,700  
Accrual Status [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, Troubled Debt Restructuring 393,300 398,300  
Accrual Status [Member] | PR And VI [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, Troubled Debt Restructuring 386,700 388,400  
Accrual Status [Member] | U S [Member]      
Financing Receivable Modifications [Line Items]      
Financing Receivable, Troubled Debt Restructuring $ 6,600 $ 9,900