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LOANS HELD FOR INVESTMENT - Additional Information IV (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]          
Loans held for investment $ 12,446,024,000   $ 12,446,024,000   $ 12,185,483,000
Recoveries 5,039,000 $ 6,173,000 28,634,000 $ 15,626,000  
Significant sales       0  
Charge-offs 29,045,000 20,259,000 84,798,000 62,260,000  
GNMA [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pooled amount 87,400,000 102,900,000 87,400,000 102,900,000  
Recognized gain on sale     3,700,000 2,200,000  
United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,168,289,000   2,168,289,000   2,022,261,000
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
Recoveries 210,000 161,000 6,287,000 383,000  
Charge-offs 1,350,000 9,000 2,141,000 6,477,000  
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,471,880,000   2,471,880,000   2,317,083,000
Recoveries 41,000 75,000 474,000 299,000  
Charge-offs 0 1,000 0 107,000  
Commercial Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     178,200,000    
Commercial Portfolio Segment [Member] | United States [Member] | Commercial And Industrial Sector [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     164,500,000 61,300,000  
Loans held for investment 961,683,000   961,683,000   924,824,000
Charge-offs     307,000    
Commercial Portfolio Segment [Member] | United States [Member] | Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     13,700,000    
Loans held for investment 674,547,000   674,547,000   526,446,000
Charge-offs     0    
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Commercial And Industrial Sector [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recoveries     5,000,000.0    
Loans sold     8,200,000    
Charge-offs 1,200,000   1,200,000    
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     38,900,000    
Residential Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,820,147,000   2,820,147,000   2,821,726,000
Recoveries 497,000 534,000 1,215,000 1,788,000  
Charge-offs 421,000 499,000 1,428,000 2,628,000  
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     1,700,000 2,500,000  
Loans held for investment 6,600,000   6,600,000   7,900,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,788,418,000   2,788,418,000   2,789,487,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | GSEs [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gain from sale of loans     600,000 700,000  
Loans sold     25,800,000 28,600,000  
Residential Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 492,469,000   492,469,000   465,720,000
Charge-offs     0    
Residential Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 483,221,000   483,221,000   458,493,000
Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 3,741,342,000   3,741,342,000   3,657,665,000
Recoveries 4,280,000 3,940,000 20,623,000 11,221,000  
Charge-offs 27,274,000 $ 19,746,000 81,229,000 $ 53,006,000  
Consumer Portfolio Segment [Member] | Bulk Sale Of Fully Charged-Off Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recoveries     10,000,000.0    
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 3,718,236,000   3,718,236,000   3,635,221,000
Consumer Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 7,601,000   7,601,000   5,895,000
Charge-offs     75,000    
Consumer Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 7,565,000   $ 7,565,000   $ 5,824,000