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LOANS HELD FOR INVESTMENT - Additional Information V (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 12,446,024		$ 12,446,024		$ 12,446,024	$ 12,185,483
Loans modified to borrowers experiencing financial difficulty	6,769	$ 4,143	$ 126,897	$ 37,965	129,103
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	2,168,289		$ 2,168,289		2,168,289	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	2,820,147		$ 2,820,147		2,820,147	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	94,457		94,457		94,457	100,236
Loans modified to borrowers experiencing financial difficulty	500	$ 900	3,700	$ 3,200
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	73,500		73,500		73,500	77,700
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	492,469		492,469		492,469	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	684		684		684	943
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	213,900		213,900		213,900	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	50,700		50,700		50,700
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	132,200		132,200		132,200
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	22,200		22,200		22,200
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	$ 48,400		$ 48,400		$ 48,400	$ 90,500

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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