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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 886,294	$ 0
Allowance for Credit Losses	0
Net Carrying Value	886,294
Gross Unrealized Gains	0
Gross Unrealized Losses	(31,557)
Fair Value	854,737
Debt securities, held to maturity, accrued interest	800
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	400,001
Allowance for Credit Losses	0
Net Carrying Value	400,001
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	400,001
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	7,781
Allowance for Credit Losses	0
Net Carrying Value	7,781
Gross Unrealized Gains
Gross Unrealized Losses	(702)
Fair Value	7,079
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,947
Allowance for Credit Losses	0
Net Carrying Value	1,947
Gross Unrealized Gains	0
Gross Unrealized Losses	(96)
Fair Value	1,851
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	209,519
Allowance for Credit Losses	0
Net Carrying Value	209,519
Gross Unrealized Gains	0
Gross Unrealized Losses	(16,681)
Fair Value	192,838
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	152,794
Allowance for Credit Losses	0
Net Carrying Value	152,794
Gross Unrealized Gains	0
Gross Unrealized Losses	(6,189)
Fair Value	146,605
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	114,252
Allowance for Credit Losses	0
Net Carrying Value	114,252
Gross Unrealized Gains	0
Gross Unrealized Losses	(7,889)
Fair Value	$ 106,363

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