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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
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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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