LOANS HELD FOR INVESTMENT - Breakdown Between Accrual and Nonaccrual Status of TDRs (Detail) - TDR - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	$ 363,394	$ 393,327
Financing Receivable Modifications Recorded Investment Nonaccrual Status	51,344	85,869
Financing Receivable, Modifications, Recorded Investment	414,738	479,196	$ 487,997	$ 582,647
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	237,627	256,779
Financing Receivable Modifications Recorded Investment Nonaccrual Status	20,946	53,827
Financing Receivable, Modifications, Recorded Investment	258,573	310,606
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	59,792	73,649
Financing Receivable Modifications Recorded Investment Nonaccrual Status	10,628	6,833
Financing Receivable, Modifications, Recorded Investment	70,420	80,482
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	52,873	45,627
Financing Receivable Modifications Recorded Investment Nonaccrual Status	15,960	18,811
Financing Receivable, Modifications, Recorded Investment	68,833	64,438
Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	14,600
Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	1,845	2,480
Financing Receivable Modifications Recorded Investment Nonaccrual Status	458	943
Financing Receivable, Modifications, Recorded Investment	2,303	3,423
Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	4,208	6,551
Financing Receivable Modifications Recorded Investment Nonaccrual Status	3,076	4,968
Financing Receivable, Modifications, Recorded Investment	7,284	11,519
Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	975	1,125
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	19
Financing Receivable, Modifications, Recorded Investment	975	1,144
Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	973	920
Financing Receivable Modifications Recorded Investment Nonaccrual Status	1	4
Financing Receivable, Modifications, Recorded Investment	974	924
Credit Cards | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	2,583	2,358
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	2,583	2,358
Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	2,518	3,838
Financing Receivable Modifications Recorded Investment Nonaccrual Status	275	464
Financing Receivable, Modifications, Recorded Investment	2,793	4,302
PR And VI [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	357,658	386,720
Financing Receivable Modifications Recorded Investment Nonaccrual Status	49,902	85,297
Financing Receivable, Modifications, Recorded Investment	407,560	472,017
PR And VI [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	234,597	253,421
Financing Receivable Modifications Recorded Investment Nonaccrual Status	19,919	53,516
Financing Receivable, Modifications, Recorded Investment	254,516	306,937
PR And VI [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	59,792	73,649
Financing Receivable Modifications Recorded Investment Nonaccrual Status	10,213	6,609
Financing Receivable, Modifications, Recorded Investment	70,005	80,258
PR And VI [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	50,608	43,012
Financing Receivable Modifications Recorded Investment Nonaccrual Status	15,960	18,811
Financing Receivable, Modifications, Recorded Investment	66,568	61,823
PR And VI [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	1,845	2,480
Financing Receivable Modifications Recorded Investment Nonaccrual Status	458	943
Financing Receivable, Modifications, Recorded Investment	2,303	3,423
PR And VI [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	4,174	6,481
Financing Receivable Modifications Recorded Investment Nonaccrual Status	3,076	4,968
Financing Receivable, Modifications, Recorded Investment	7,250	11,449
PR And VI [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	975	1,125
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	19
Financing Receivable, Modifications, Recorded Investment	975	1,144
PR And VI [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	973	920
Financing Receivable Modifications Recorded Investment Nonaccrual Status	1	4
Financing Receivable, Modifications, Recorded Investment	974	924
PR And VI [Member] | Credit Cards | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	2,583	2,358
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	2,583	2,358
PR And VI [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	2,111	3,274
Financing Receivable Modifications Recorded Investment Nonaccrual Status	275	427
Financing Receivable, Modifications, Recorded Investment	2,386	3,701
FL
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	5,736	6,607
Financing Receivable Modifications Recorded Investment Nonaccrual Status	1,442	572
Financing Receivable, Modifications, Recorded Investment	7,178	7,179
FL | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	3,030	3,358
Financing Receivable Modifications Recorded Investment Nonaccrual Status	1,027	311
Financing Receivable, Modifications, Recorded Investment	4,057	3,669
FL | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	0	0
Financing Receivable Modifications Recorded Investment Nonaccrual Status	415	224
Financing Receivable, Modifications, Recorded Investment	415	224
FL | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	2,265	2,615
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	2,265	2,615
FL | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	0	0
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	0	0
FL | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	34	70
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	34	70
FL | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	0	0
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	0	0
FL | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	0	0
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	0	0
FL | Credit Cards | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	0	0
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	0
Financing Receivable, Modifications, Recorded Investment	0	0
FL | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	407	564
Financing Receivable Modifications Recorded Investment Nonaccrual Status	0	37
Financing Receivable, Modifications, Recorded Investment	$ 407	$ 601