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LOANS HELD FOR INVESTMENT - Corporation's Residential Mortgage Loans by Origination Year Based on Original Loan-To-Value-Ratio (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 11,140,582	$ 11,777,289
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,150,483	9,788,106
Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,990,099	1,989,183
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	91,132
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	73,910
Financing Receivable, Originated Two Years before Latest Fiscal Year	108,810
Financing Receivable, Originated Three Years before Latest Fiscal Year	145,944
Financing Receivable, Originated Four Years before Latest Fiscal Year	135,486
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,539,733
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	3,095,015	3,521,954
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	51,211
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	35,549
Financing Receivable, Originated Two Years before Latest Fiscal Year	62,409
Financing Receivable, Originated Three Years before Latest Fiscal Year	92,201
Financing Receivable, Originated Four Years before Latest Fiscal Year	69,713
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,330,080
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	2,641,163	3,002,203
Residential Portfolio Segment [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	39,921
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	38,361
Financing Receivable, Originated Two Years before Latest Fiscal Year	46,401
Financing Receivable, Originated Three Years before Latest Fiscal Year	53,743
Financing Receivable, Originated Four Years before Latest Fiscal Year	65,773
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	209,653
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	453,852	519,751
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	359
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,090
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,168
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,134
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	126,534
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	134,285	150,734
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	359
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,090
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,168
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,134
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	125,661
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	133,412	149,564
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	873
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	873	1,170
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,960,730	3,371,220
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,507,751	2,852,639
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, before Allowance for Credit Loss	452,979	518,581
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less than or equal to 90 percent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	85,963
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	68,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	98,652
Financing Receivable, Originated Three Years before Latest Fiscal Year	131,525
Financing Receivable, Originated Four Years before Latest Fiscal Year	120,449
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,724,477
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	2,229,122	2,526,587
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less than or equal to 90 percent [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	48,455
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	33,546
Financing Receivable, Originated Two Years before Latest Fiscal Year	53,445
Financing Receivable, Originated Three Years before Latest Fiscal Year	79,273
Financing Receivable, Originated Four Years before Latest Fiscal Year	58,300
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,518,623
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	1,791,642	2,029,177
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less than or equal to 90 percent [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	37,508
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,510
Financing Receivable, Originated Two Years before Latest Fiscal Year	45,207
Financing Receivable, Originated Three Years before Latest Fiscal Year	52,252
Financing Receivable, Originated Four Years before Latest Fiscal Year	62,149
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	205,854
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	437,480	497,410
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 90 percent but less than or equal to 100 percent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,054
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,495
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,139
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,876
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,363
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	607,414
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	641,341	746,220
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 90 percent but less than or equal to 100 percent [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	641
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,644
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,945
Financing Receivable, Originated Three Years before Latest Fiscal Year	7,385
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,739
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	604,488
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	625,842	725,049
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 90 percent but less than or equal to 100 percent [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,413
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,851
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,194
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,491
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,624
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,926
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	15,499	21,171
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 100 percent [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,115
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	929
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,375
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,540
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	81,308
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	90,267	98,413
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 100 percent [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,115
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	929
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,375
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,540
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	81,308
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	90,267	98,413
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Greater than 100 percent [Member] | Florida region [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	$ 0	$ 0

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Amount of financing receivable originated more than five years prior to current fiscal year.

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