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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	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 11,097,705		$ 11,060,658
Financing Receivable, 90 Days or More Past Due, Still Accruing	117,124		114,679
PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,155,295		9,113,918
Financing Receivable, 90 Days or More Past Due, Still Accruing	116,993		114,497
U S [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,942,410		1,946,740
Financing Receivable, 90 Days or More Past Due, Still Accruing	131		182
Portion Of Such Loans Contractually Past Due 90 Or More [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	18,000		20,600
Portion Of Such Loans Contractually Past Due 90 Or More [Member] | Conventional Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	16,400		19,100
Portion Of Such Loans Contractually Past Due 90 Or More [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	1,600		1,500
Portion Of Such Loans Contractually Past Due 90 Or More [Member] | PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	18,000		20,600
Portion Of Such Loans Contractually Past Due 90 Or More [Member] | PR And VI [Member] | Conventional Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	16,400		19,100
Portion Of Such Loans Contractually Past Due 90 Or More [Member] | PR And VI [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	1,600		1,500
Residential Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,891,699		2,978,895
Residential Portfolio Segment [Member] | PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,487,093		2,549,573
Residential Portfolio Segment [Member] | U S [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	404,606		429,322
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,500		7,200
Financing Receivable, 90 Days or More Past Due, Still Accruing	9,500		7,200
Financing Receivable, Purchase	500	$ 300
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	9,500		7,200
PCD loans [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	113,500		117,500
PCD loans [Member] | PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	113,500
Accrual Status [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Troubled Debt Restructuring	354,000		363,400
Accrual Status [Member] | PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Troubled Debt Restructuring	348,300		357,700
Financing Receivable, before Allowance for Credit Loss			117,500
Accrual Status [Member] | U S [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Troubled Debt Restructuring	5,700		5,700
Accrual Status [Member] | Residential Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,842,881		2,923,768
Accrual Status [Member] | Residential Portfolio Segment [Member] | PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,443,894		2,501,598
Accrual Status [Member] | Residential Portfolio Segment [Member] | U S [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 398,987		$ 422,170

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