LOANS HELD FOR INVESTMENT - Collateral Deoendent Loans Individually Evaluated (Detail) - Collateral Pledged [Member] $ in Thousands	Mar. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	$ 171,351
Loans individually evaluated related allowance	24,554
Loans individually evaluated with no related specific allowance amortized cost	120,505
Total loans individually evaluated amortized cost	291,856
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	135,559
Loans individually evaluated related allowance	13,778
Loans individually evaluated with no related specific allowance amortized cost	46,477
Total loans individually evaluated amortized cost	182,036
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	12,763
Loans individually evaluated related allowance	5,653
Loans individually evaluated with no related specific allowance amortized cost	17,588
Total loans individually evaluated amortized cost	30,351
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	21,990
Loans individually evaluated related allowance	5,053
Loans individually evaluated with no related specific allowance amortized cost	47,019
Total loans individually evaluated amortized cost	69,009
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	9,358
Total loans individually evaluated amortized cost	9,358
Consumer Portfolio Segment [Member] | Auto loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Consumer Portfolio Segment [Member] | Finance Leases [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	146
Loans individually evaluated related allowance	2
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	146
Consumer Portfolio Segment [Member] | Credit cards [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	893
Loans individually evaluated related allowance	68
Loans individually evaluated with no related specific allowance amortized cost	63
Total loans individually evaluated amortized cost	956
Puerto Rico and Virgin Islands regions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	162,892
Loans individually evaluated related allowance	23,463
Loans individually evaluated with no related specific allowance amortized cost	114,331
Total loans individually evaluated amortized cost	277,223
Puerto Rico and Virgin Islands regions [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Puerto Rico and Virgin Islands regions [Member] | Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	127,100
Loans individually evaluated related allowance	12,687
Loans individually evaluated with no related specific allowance amortized cost	45,770
Total loans individually evaluated amortized cost	172,870
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	12,763
Loans individually evaluated related allowance	5,653
Loans individually evaluated with no related specific allowance amortized cost	17,296
Total loans individually evaluated amortized cost	30,059
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	21,990
Loans individually evaluated related allowance	5,053
Loans individually evaluated with no related specific allowance amortized cost	41,844
Total loans individually evaluated amortized cost	63,834
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	9,358
Total loans individually evaluated amortized cost	9,358
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Auto loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Finance Leases [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	146
Loans individually evaluated related allowance	2
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	146
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Credit cards [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	893
Loans individually evaluated related allowance	68
Loans individually evaluated with no related specific allowance amortized cost	63
Total loans individually evaluated amortized cost	956
Florida region
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	8,459
Loans individually evaluated related allowance	1,091
Loans individually evaluated with no related specific allowance amortized cost	6,174
Total loans individually evaluated amortized cost	14,633
Florida region | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	292
Total loans individually evaluated amortized cost	292
Florida region | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	5,175
Total loans individually evaluated amortized cost	5,175
Florida region | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Consumer Portfolio Segment [Member] | Auto loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Consumer Portfolio Segment [Member] | Finance Leases [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Consumer Portfolio Segment [Member] | Credit cards [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	0
Florida region | Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans individually evaluated with a specific allowance amortized cost	0
Loans individually evaluated related allowance	0
Loans individually evaluated with no related specific allowance amortized cost	0
Total loans individually evaluated amortized cost	$ 0