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LOANS HELD FOR INVESTMENT - Additional Information IIII (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | $ 12,311,448,000 |  | $ 12,185,483,000
Recoveries | 18,171,000 | $ 4,648,000 |
Significant sales |  | 0 |
GNMA [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans pooled amount | 24,700,000 | 29,400,000 |
Recognized gain on sale | 900,000 | 900,000 |
United States [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 2,103,118,000 |  | 2,022,261,000
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Significant Purchases |  | 0 |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 2,361,731,000 |  | 2,317,083,000
Recoveries | 40,000 | 168,000 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 3,230,995,000 |  | 3,174,232,000
Recoveries | 5,119,000 | 90,000 |
Commercial Portfolio Segment [Member] | United States [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Significant Purchases | 23,200,000 |  |
Commercial Portfolio Segment [Member] | United States [Member] | Mortgage Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Significant Purchases | 13,700,000 |  |
Loans held for investment | 592,484,000 |  | 526,446,000
Commercial Portfolio Segment [Member] | United States [Member] | Commercial And Industrial Sector [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Significant Purchases | 9,500,000 |  |
Loans held for investment | 940,996,000 |  | 924,824,000
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 2,801,587,000 |  | 2,821,726,000
Recoveries | 272,000 | 497,000 |
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 | 200,000 | 1,500,000 |
Loans held for investment | 8,800,000 |  | 7,900,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 2,768,902,000 |  | 2,789,487,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Fnma Fhlmc Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain from sale of loans |  |  | 200,000
Residential mortgage loans sold | 6,800,000 | 8,000,000.0 |
Residential Portfolio Segment [Member] | United States [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 474,347,000 |  | 465,720,000
Residential Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 465,876,000 |  | 458,493,000
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 3,679,847,000 |  | 3,657,665,000
Recoveries | 12,730,000 | $ 3,830,000 |
Consumer Portfolio Segment [Member] | Bulk Sale Of Fully Charged-Off Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | 9,500,000 |  |
Repurchase liability | 500,000 |  |
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 3,658,108,000 |  | 3,635,221,000
Consumer Portfolio Segment [Member] | United States [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | 5,627,000 |  | 5,895,000
Consumer Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for investment | $ 5,594,000 |  | $ 5,824,000

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