LOANS HELD FOR INVESTMENT - Additional Information IV (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 12,746,556,000	$ 12,185,483,000
Recoveries	33,066,000	20,721,000	$ 23,085,000
Significant sales		0
Charge-offs	113,828,000	88,102,000	57,330,000
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,294,950,000	2,022,261,000
GNMA [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pooled amount	127,900,000	125,400,000	144,500,000
Recognized gain on sale	4,600,000	2,600,000	4,200,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,828,431,000	2,821,726,000
Recoveries	1,453,000	2,692,000	3,547,000
Charge-offs	1,971,000	3,245,000	6,890,000
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	505,226,000	465,720,000
Charge-offs	0	6,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,796,482,000	2,789,487,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	496,686,000	458,493,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | GSEs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	32,100,000	29,800,000	93,800,000
Gain from sale of loans	800,000	700,000	4,200,000
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	31,949,000	32,239,000
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,540,000	7,227,000
Commercial Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchased loans	223,900,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,366,038,000	3,174,232,000
Recoveries	6,704,000	841,000	2,459,000
Charge-offs	2,742,000	6,936,000	2,067,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,040,163,000	924,824,000
Repurchased loans	210,200,000	61,300,000	135,400,000
Significant sales			23,900,000
Charge-offs	307,000	6,578,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	8,200,000
Recoveries	5,000,000.0
Significant sales			35,200,000
Charge-offs	1,200,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Nonperforming Financial Instruments [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	8,200,000
Charge-offs	1,200,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,565,984,000	2,317,083,000
Recoveries	533,000	786,000	1,372,000
Charge-offs	0	1,133,000	85,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	698,090,000	526,446,000
Repurchased loans	13,700,000
Charge-offs	0	0
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchased loans	38,900,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,757,707,000	3,657,665,000
Recoveries	24,245,000	14,451,000	14,982,000
Charge-offs	109,115,000	76,726,000	48,165,000
Consumer Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	7,502,000	5,895,000
Charge-offs	77,000	324,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,734,919,000	3,635,221,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	7,457,000	5,824,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	22,788,000	22,444,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	45,000	71,000
Repurchase Option Program [Member] | Past Due [Member] | Residential Portfolio Segment [Member] | GNMA [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,700,000	7,900,000
Repurchased loans	2,200,000	$ 2,900,000	$ 8,200,000
Bulk Sale Of Fully Charged-Off Loans [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries	$ 10,000,000.0