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Investment Securities - Summary of Held to Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Jun. 30, 2023 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 1,258,560
Fair Value	1,212,248
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	719,551
Fair Value	714,434
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	7,115
Fair Value	6,446
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,889
Fair Value	1,786
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	196,206
Fair Value	179,702
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	148,066
Fair Value	138,827
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	185,733
Fair Value	$ 171,053

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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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