LOANS HELD FOR INVESTMENT - Loan Modifications are Considered TDRs (Detail) - TDR $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) numberofcontracts	Dec. 31, 2019 USD ($) numberofcontracts	Dec. 31, 2018 USD ($) numberofcontracts
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	648	1,309	1,228
Pre-modification Outstanding Recorded Investment	$ 37,140	$ 66,184	$ 173,082
Post-Modification Outstanding Recorded Investment	$ 36,319	$ 63,433	$ 171,857
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	103	118	104
Pre-modification Outstanding Recorded Investment	$ 9,027	$ 14,606	$ 14,827
Post-Modification Outstanding Recorded Investment	$ 8,307	$ 14,084	$ 14,159
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	14	14	10
Pre-modification Outstanding Recorded Investment	$ 22,544	$ 1,754	$ 9,141
Post-Modification Outstanding Recorded Investment	$ 22,524	$ 1,750	$ 8,786
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	5	13	11
Pre-modification Outstanding Recorded Investment	$ 824	$ 40,988	$ 138,994
Post-Modification Outstanding Recorded Investment	$ 824	$ 38,750	$ 138,785
Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	4	2
Pre-modification Outstanding Recorded Investment	$ 0	$ 118	$ 684
Post-Modification Outstanding Recorded Investment	$ 0	$ 117	$ 655
Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	163	256	285
Pre-modification Outstanding Recorded Investment	$ 2,635	$ 4,201	$ 4,500
Post-Modification Outstanding Recorded Investment	$ 2,623	$ 4,154	$ 4,489
Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	29	42	48
Pre-modification Outstanding Recorded Investment	$ 408	$ 804	$ 1,001
Post-Modification Outstanding Recorded Investment	$ 408	$ 801	$ 987
Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	30	53	54
Pre-modification Outstanding Recorded Investment	$ 306	$ 502	$ 605
Post-Modification Outstanding Recorded Investment	$ 305	$ 499	$ 603
Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	159	153	203
Pre-modification Outstanding Recorded Investment	$ 783	$ 800	$ 1,193
Post-Modification Outstanding Recorded Investment	$ 783	$ 800	$ 1,193
Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	145	656	511
Pre-modification Outstanding Recorded Investment	$ 613	$ 2,411	$ 2,137
Post-Modification Outstanding Recorded Investment	$ 545	$ 2,478	$ 2,200
PR And VI [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	647	1,306	1,210
Pre-modification Outstanding Recorded Investment	$ 37,117	$ 66,151	$ 172,811
Post-Modification Outstanding Recorded Investment	$ 36,296	$ 63,400	$ 171,586
PR And VI [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	103	118	104
Pre-modification Outstanding Recorded Investment	$ 9,027	$ 14,606	$ 14,827
Post-Modification Outstanding Recorded Investment	$ 8,307	$ 14,084	$ 14,159
PR And VI [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	14	14	10
Pre-modification Outstanding Recorded Investment	$ 22,544	$ 1,754	$ 9,141
Post-Modification Outstanding Recorded Investment	$ 22,524	$ 1,750	$ 8,786
PR And VI [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	5	13	11
Pre-modification Outstanding Recorded Investment	$ 824	$ 40,988	$ 138,994
Post-Modification Outstanding Recorded Investment	$ 824	$ 38,750	$ 138,785
PR And VI [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	4	2
Pre-modification Outstanding Recorded Investment	$ 0	$ 118	$ 684
Post-Modification Outstanding Recorded Investment	$ 0	$ 117	$ 655
PR And VI [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	163	253	267
Pre-modification Outstanding Recorded Investment	$ 2,635	$ 4,168	$ 4,229
Post-Modification Outstanding Recorded Investment	$ 2,623	$ 4,121	$ 4,218
PR And VI [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	29	42	48
Pre-modification Outstanding Recorded Investment	$ 408	$ 804	$ 1,001
Post-Modification Outstanding Recorded Investment	$ 408	$ 801	$ 987
PR And VI [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	30	53	54
Pre-modification Outstanding Recorded Investment	$ 306	$ 502	$ 605
Post-Modification Outstanding Recorded Investment	$ 305	$ 499	$ 603
PR And VI [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	159	153	203
Pre-modification Outstanding Recorded Investment	$ 783	$ 800	$ 1,193
Post-Modification Outstanding Recorded Investment	$ 783	$ 800	$ 1,193
PR And VI [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	144	656	511
Pre-modification Outstanding Recorded Investment	$ 590	$ 2,411	$ 2,137
Post-Modification Outstanding Recorded Investment	$ 522	$ 2,478	$ 2,200
FL
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	1	3	18
Pre-modification Outstanding Recorded Investment	$ 23	$ 33	$ 271
Post-Modification Outstanding Recorded Investment	$ 23	$ 33	$ 271
FL | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	3	18
Pre-modification Outstanding Recorded Investment	$ 0	$ 33	$ 271
Post-Modification Outstanding Recorded Investment	$ 0	$ 33	$ 271
FL | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	0	0	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
FL | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Number of contracts | numberofcontracts	1	0	0
Pre-modification Outstanding Recorded Investment	$ 23	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 23	$ 0	$ 0