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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 495,039	$ 0
Allowance for Credit Losses	0
Net Carrying Value	495,039
Gross Unrealized Gains	4
Gross Unrealized Losses	(9,408)
Fair Value	485,635
Debt securities, held to maturity, accrued interest	700
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	7,820
Allowance for Credit Losses	0
Net Carrying Value	7,820
Gross Unrealized Gains	0
Gross Unrealized Losses	(181)
Fair Value	7,639
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,966
Allowance for Credit Losses	0
Net Carrying Value	1,966
Gross Unrealized Gains	0
Gross Unrealized Losses	(5)
Fair Value	1,961
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	215,996
Allowance for Credit Losses	0
Net Carrying Value	215,996
Gross Unrealized Gains	0
Gross Unrealized Losses	(4,368)
Fair Value	211,628
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	154,204
Allowance for Credit Losses	0
Net Carrying Value	154,204
Gross Unrealized Gains	4
Gross Unrealized Losses	(1,041)
Fair Value	153,167
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	115,053
Allowance for Credit Losses	0
Net Carrying Value	115,053
Gross Unrealized Gains	0
Gross Unrealized Losses	(3,813)
Fair Value	$ 111,240

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