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LOANS HELD FOR INVESTMENT - Additional Information IV (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 12,385,508		$ 12,385,508		$ 12,385,508	$ 12,185,483
Loans modified to borrowers experiencing financial difficulty	118,860	$ 32,263	$ 121,365	$ 34,208	126,308
Puerto Rico [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			80.00%
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,120,798		$ 2,120,798		2,120,798	2,022,261
United States [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			17.00%
USVI and BVI [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			3.00%
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,809,666		$ 2,809,666		2,809,666	2,821,726
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	96,143		96,143		96,143	100,236
Loans modified to borrowers experiencing financial difficulty	2,300	$ 1,600	3,800	$ 2,500
Residential Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Puerto Rico Housing Finance Authority [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	74,900		74,900		74,900	77,700
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	485,364		485,364		485,364	465,720
Residential Portfolio Segment [Member] | United States [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	692		692		692	943
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	206,200		206,200		206,200	187,700
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Central Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	42,300		42,300		42,300
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Property Tax Revenue [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	129,400		129,400		129,400
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Municipal Special Obligation Bond [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	25,700		25,700		25,700
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Puerto Rico Electric Power Authority [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,800		8,800		8,800
Commercial Portfolio Segment [Member] | V I [Member] | Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 105,000		$ 105,000		$ 105,000	$ 90,500

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