LOANS HELD FOR INVESTMENT - Corporation's Residential Mortgage Loans By Origination Year Based on Accrual Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 11,552,825	$ 11,060,658
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	9,464,474	9,113,918
Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,088,351	1,946,740
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	256,296
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	125,604
Financing Receivable, Originated Two Years before Latest Fiscal Year	64,092
Financing Receivable, Originated Three Years before Latest Fiscal Year	80,953
Financing Receivable, Originated Four Years before Latest Fiscal Year	114,093
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,206,252
Financing Receivable, Revolving	0
Loans held for investment	2,847,290	2,978,895
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	256,296
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	125,569
Financing Receivable, Originated Two Years before Latest Fiscal Year	64,092
Financing Receivable, Originated Three Years before Latest Fiscal Year	80,462
Financing Receivable, Originated Four Years before Latest Fiscal Year	113,337
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,164,762
Financing Receivable, Revolving	0
Loans held for investment	2,804,518	2,923,768
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	35
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	491
Financing Receivable, Originated Four Years before Latest Fiscal Year	756
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	41,490
Financing Receivable, Revolving	0
Loans held for investment	42,772	55,127
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	173,328
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	76,125
Financing Receivable, Originated Two Years before Latest Fiscal Year	32,687
Financing Receivable, Originated Three Years before Latest Fiscal Year	49,537
Financing Receivable, Originated Four Years before Latest Fiscal Year	76,348
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,009,875
Financing Receivable, Revolving	0
Loans held for investment	2,417,900	2,549,573
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	173,328
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	76,090
Financing Receivable, Originated Two Years before Latest Fiscal Year	32,687
Financing Receivable, Originated Three Years before Latest Fiscal Year	49,318
Financing Receivable, Originated Four Years before Latest Fiscal Year	76,069
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,974,937
Financing Receivable, Revolving	0
Loans held for investment	2,382,429	2,501,598
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	35
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	219
Financing Receivable, Originated Four Years before Latest Fiscal Year	279
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	34,938
Financing Receivable, Revolving	0
Loans held for investment	35,471	47,975
Residential Portfolio Segment [Member] | Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	82,968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	49,479
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,405
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,416
Financing Receivable, Originated Four Years before Latest Fiscal Year	37,745
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	196,377
Financing Receivable, Revolving	0
Loans held for investment	429,390	429,322
Residential Portfolio Segment [Member] | Florida region [Member} | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	82,968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	49,479
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,405
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,144
Financing Receivable, Originated Four Years before Latest Fiscal Year	37,268
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	189,825
Financing Receivable, Revolving	0
Loans held for investment	422,089	422,170
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	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	272
Financing Receivable, Originated Four Years before Latest Fiscal Year	477
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,552
Financing Receivable, Revolving	0
Loans held for investment	7,301	7,152
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated in Current Fiscal Year	700
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	693
Financing Receivable, Originated Two Years before Latest Fiscal Year	802
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,407
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,784
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	110,772
Financing Receivable, Revolving	0
Loans held for investment	118,158	125,392
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	700
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	693
Financing Receivable, Originated Two Years before Latest Fiscal Year	802
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,407
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,784
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	110,772
Financing Receivable, Revolving	0
Loans held for investment	118,158	125,392
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	700
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	693
Financing Receivable, Originated Two Years before Latest Fiscal Year	802
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,407
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,784
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	110,030
Financing Receivable, Revolving	0
Loans held for investment	117,416	124,652
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	700
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	693
Financing Receivable, Originated Two Years before Latest Fiscal Year	802
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,407
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,784
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	110,030
Financing Receivable, Revolving	0
Loans held for investment	117,416	124,652
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	742
Financing Receivable, Revolving	0
Loans held for investment	742	740
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	742
Financing Receivable, Revolving	0
Loans held for investment	742	740
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	255,596
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	124,911
Financing Receivable, Originated Two Years before Latest Fiscal Year	63,290
Financing Receivable, Originated Three Years before Latest Fiscal Year	79,546
Financing Receivable, Originated Four Years before Latest Fiscal Year	110,309
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,095,480
Financing Receivable, Revolving	0
Loans held for investment	2,729,132	2,853,503
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	255,596
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	124,876
Financing Receivable, Originated Two Years before Latest Fiscal Year	63,290
Financing Receivable, Originated Three Years before Latest Fiscal Year	79,055
Financing Receivable, Originated Four Years before Latest Fiscal Year	109,553
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,053,990
Financing Receivable, Revolving	0
Loans held for investment	2,686,360	2,798,376
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	35
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	491
Financing Receivable, Originated Four Years before Latest Fiscal Year	756
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	41,490
Financing Receivable, Revolving	0
Loans held for investment	42,772	55,127
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	172,628
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,432
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,885
Financing Receivable, Originated Three Years before Latest Fiscal Year	48,130
Financing Receivable, Originated Four Years before Latest Fiscal Year	72,564
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,899,845
Financing Receivable, Revolving	0
Loans held for investment	2,300,484	2,424,921
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	172,628
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,397
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,885
Financing Receivable, Originated Three Years before Latest Fiscal Year	47,911
Financing Receivable, Originated Four Years before Latest Fiscal Year	72,285
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,864,907
Financing Receivable, Revolving	0
Loans held for investment	2,265,013	2,376,946
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	35
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	219
Financing Receivable, Originated Four Years before Latest Fiscal Year	279
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	34,938
Financing Receivable, Revolving	0
Loans held for investment	35,471	47,975
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	82,968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	49,479
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,405
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,416
Financing Receivable, Originated Four Years before Latest Fiscal Year	37,745
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	195,635
Financing Receivable, Revolving	0
Loans held for investment	428,648	428,582
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	82,968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	49,479
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,405
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,144
Financing Receivable, Originated Four Years before Latest Fiscal Year	37,268
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	189,083
Financing Receivable, Revolving	0
Loans held for investment	421,347	421,430
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	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	272
Financing Receivable, Originated Four Years before Latest Fiscal Year	477
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,552
Financing Receivable, Revolving	0
Loans held for investment	$ 7,301	$ 7,152