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INVESTMENT SECURITIES - Summary of Held-to-Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Jun. 30, 2025 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 853,126
Fair Value	794,435
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	352,781
Fair Value	351,435
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	6,792
Fair Value	5,850
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,729
Fair Value	1,486
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	161,284
Fair Value	143,782
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	170,372
Fair Value	145,216
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	160,168
Fair Value	$ 146,666

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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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