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INVESTMENT SECURITIES - Summary of Held-to-Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Sep. 30, 2024 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 1,064,437
Fair Value	1,027,514
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	538,832
Fair Value	540,276
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	6,920
Fair Value	6,398
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,790
Fair Value	1,519
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	174,098
Fair Value	162,877
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	159,050
Fair Value	139,624
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	183,747
Fair Value	$ 176,820

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- Definition

Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.

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