LOANS HELD FOR INVESTMENT - Corporation's Residential Mortgage Loans By Origination Year Based on Accrual Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 11,060,658	$ 11,777,289
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	9,113,918	9,788,106
Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,946,740	1,989,183
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	133,159
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	72,704
Financing Receivable, Originated Two Years before Latest Fiscal Year	100,528
Financing Receivable, Originated Three Years before Latest Fiscal Year	139,939
Financing Receivable, Originated Four Years before Latest Fiscal Year	123,584
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,408,981
Financing Receivable, Revolving	0
Loans held for investment	2,978,895	3,521,954
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	133,159
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	72,704
Financing Receivable, Originated Two Years before Latest Fiscal Year	100,121
Financing Receivable, Originated Three Years before Latest Fiscal Year	139,660
Financing Receivable, Originated Four Years before Latest Fiscal Year	123,228
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,354,896
Financing Receivable, Revolving	0
Loans held for investment	2,923,768	3,396,587
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	407
Financing Receivable, Originated Three Years before Latest Fiscal Year	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	356
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	54,085
Financing Receivable, Revolving	0
Loans held for investment	55,127	125,367
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	79,765
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	35,104
Financing Receivable, Originated Two Years before Latest Fiscal Year	59,678
Financing Receivable, Originated Three Years before Latest Fiscal Year	88,069
Financing Receivable, Originated Four Years before Latest Fiscal Year	65,304
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,221,653
Financing Receivable, Revolving	0
Loans held for investment	2,549,573	3,002,203
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	79,765
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	35,104
Financing Receivable, Originated Two Years before Latest Fiscal Year	59,564
Financing Receivable, Originated Three Years before Latest Fiscal Year	87,790
Financing Receivable, Originated Four Years before Latest Fiscal Year	65,162
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,174,213
Financing Receivable, Revolving	0
Loans held for investment	2,501,598	2,891,258
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	114
Financing Receivable, Originated Three Years before Latest Fiscal Year	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	142
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,440
Financing Receivable, Revolving	0
Loans held for investment	47,975	110,945
Residential Portfolio Segment [Member] | Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	53,394
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,600
Financing Receivable, Originated Two Years before Latest Fiscal Year	40,850
Financing Receivable, Originated Three Years before Latest Fiscal Year	51,870
Financing Receivable, Originated Four Years before Latest Fiscal Year	58,280
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	187,328
Financing Receivable, Revolving	0
Loans held for investment	429,322	519,751
Residential Portfolio Segment [Member] | Florida region [Member} | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	53,394
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,600
Financing Receivable, Originated Two Years before Latest Fiscal Year	40,557
Financing Receivable, Originated Three Years before Latest Fiscal Year	51,870
Financing Receivable, Originated Four Years before Latest Fiscal Year	58,066
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	180,683
Financing Receivable, Revolving	0
Loans held for investment	422,170	505,329
Residential Portfolio Segment [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	293
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	214
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,645
Financing Receivable, Revolving	0
Loans held for investment	7,152	14,422
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	362
Financing Receivable, Originated Two Years before Latest Fiscal Year	914
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,051
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,769
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	118,296
Financing Receivable, Revolving	0
Loans held for investment	125,392	150,734
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	362
Financing Receivable, Originated Two Years before Latest Fiscal Year	914
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,051
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,769
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	118,296
Financing Receivable, Revolving	0
Loans held for investment	125,392	150,734
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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
Loans held for investment	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	362
Financing Receivable, Originated Two Years before Latest Fiscal Year	914
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,051
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,769
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	117,556
Financing Receivable, Revolving	0
Loans held for investment	124,652	149,564
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	362
Financing Receivable, Originated Two Years before Latest Fiscal Year	914
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,051
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,769
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	117,556
Financing Receivable, Revolving	0
Loans held for investment	124,652	149,564
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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
Loans held for investment	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member}
Financing Receivable, Recorded Investment [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	740
Financing Receivable, Revolving	0
Loans held for investment	740	1,170
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	740
Financing Receivable, Revolving	0
Loans held for investment	740	1,170
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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
Loans held for investment	0	0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	133,159
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	72,342
Financing Receivable, Originated Two Years before Latest Fiscal Year	99,614
Financing Receivable, Originated Three Years before Latest Fiscal Year	137,888
Financing Receivable, Originated Four Years before Latest Fiscal Year	119,815
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,290,685
Financing Receivable, Revolving	0
Loans held for investment	2,853,503	3,371,220
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	133,159
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	72,342
Financing Receivable, Originated Two Years before Latest Fiscal Year	99,207
Financing Receivable, Originated Three Years before Latest Fiscal Year	137,609
Financing Receivable, Originated Four Years before Latest Fiscal Year	119,459
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,236,600
Financing Receivable, Revolving	0
Loans held for investment	2,798,376	3,245,853
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	407
Financing Receivable, Originated Three Years before Latest Fiscal Year	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	356
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	54,085
Financing Receivable, Revolving	0
Loans held for investment	55,127	125,367
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	79,765
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,742
Financing Receivable, Originated Two Years before Latest Fiscal Year	58,764
Financing Receivable, Originated Three Years before Latest Fiscal Year	86,018
Financing Receivable, Originated Four Years before Latest Fiscal Year	61,535
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,104,097
Financing Receivable, Revolving	0
Loans held for investment	2,424,921	2,852,639
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	79,765
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,742
Financing Receivable, Originated Two Years before Latest Fiscal Year	58,650
Financing Receivable, Originated Three Years before Latest Fiscal Year	85,739
Financing Receivable, Originated Four Years before Latest Fiscal Year	61,393
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,056,657
Financing Receivable, Revolving	0
Loans held for investment	2,376,946	2,741,694
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	114
Financing Receivable, Originated Three Years before Latest Fiscal Year	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	142
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,440
Financing Receivable, Revolving	0
Loans held for investment	47,975	110,945
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	53,394
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,600
Financing Receivable, Originated Two Years before Latest Fiscal Year	40,850
Financing Receivable, Originated Three Years before Latest Fiscal Year	51,870
Financing Receivable, Originated Four Years before Latest Fiscal Year	58,280
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	186,588
Financing Receivable, Revolving	0
Loans held for investment	428,582	518,581
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	53,394
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,600
Financing Receivable, Originated Two Years before Latest Fiscal Year	40,557
Financing Receivable, Originated Three Years before Latest Fiscal Year	51,870
Financing Receivable, Originated Four Years before Latest Fiscal Year	58,066
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	179,943
Financing Receivable, Revolving	0
Loans held for investment	421,430	504,159
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [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	293
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	214
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,645
Financing Receivable, Revolving	0
Loans held for investment	$ 7,152	$ 14,422