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LOANS HELD FOR INVESTMENT - Additional Information III (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving loans converted to term loans	$ 0		$ 0		$ 0
Interest receivable	67,112,000		67,112,000		77,716,000
Loans held for investment	12,446,024,000		12,446,024,000		12,185,483,000
Charge-offs	29,045,000	$ 20,259,000	84,798,000	$ 62,260,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,205,313,000		3,205,313,000		3,174,232,000
Charge-offs	1,350,000	$ 9,000	2,141,000	$ 6,477,000
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Commercial And Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold			8,200,000
Charge-offs	1,200,000		1,200,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial relationship	16,500,000		16,500,000
Collateral Pledged [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial relationship	45,192,000		45,192,000		39,350,000
Collateral Pledged [Member] | Nonperforming Financial Instruments [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial relationship	16,500,000		16,500,000
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual commercial relationship	$ 13,348,000		$ 13,348,000		$ 9,390,000
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV Coverage %	100.00%		100.00%
Collateral Pledged [Member] | Weighted Average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV Coverage %	72.00%		72.00%		65.00%
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 55,100,000		$ 55,100,000		$ 62,300,000

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Amount of investment in collateral dependent financing receivable individually evaluated for purposes of determining the ACL for wich there is a related allowance for credit losses.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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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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Amortized cost of revolving financing receivable converted to term loan.

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