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INVESTMENT SECURITIES - Summary of Held-to-Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Mar. 31, 2025 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 938,161
Fair Value	886,538
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	409,904
Fair Value	408,670
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	6,833
Fair Value	6,011
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,750
Fair Value	1,488
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	165,521
Fair Value	148,673
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	171,307
Fair Value	149,605
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	182,846
Fair Value	$ 172,091

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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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