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Investment Securities - Summary of Held-to-Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 1,032,037
Fair Value	972,628
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	509,690
Fair Value	507,603
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	7,001
Fair Value	5,914
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,830
Fair Value	1,679
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	182,856
Fair Value	162,133
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	146,001
Fair Value	124,466
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	184,659
Fair Value	$ 170,833

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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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