DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,979,832	$ 1,985,438
Other real estate owned	12,432	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	281,839	13,236
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	281,839	13,236
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 281,839	$ 13,236
Other real estate owned | Significant Unobservable Inputs (Level 3) | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, weighted average range	6.00%
Other real estate owned | Significant Unobservable Inputs (Level 3) | Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 12,432
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.08	0.09
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.04	0.05
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.19	0.19
Minimum | Other real estate owned | Significant Unobservable Inputs (Level 3) | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, weighted average range	6.00%
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.09	0.10
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.12	0.10
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.20	0.20
Maximum | Other real estate owned | Significant Unobservable Inputs (Level 3) | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, weighted average range	7.00%
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.08	0.10
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.06	0.07
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset-backed securities, measurement input	0.19	0.19