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Summary of Significant Accounting Policies - Additional Information (Detail) | 6 Months Ended |  |
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Jun. 30, 2025 Integer | Aug. 23, 2024 | Mar. 05, 2007 Branches
Description Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Entity incorporation date of incorporation | Mar. 05, 2007 |  |
State in which the entity was incorporated | NJ |  |
Year of incorporation | 2007 |  |
Operations commencement date | Apr. 23, 2007 |  |
Number of branches owned by the entity | Branches |  |  | 35
Number of employees | 251 |  |
Number of full time employees | 247 |  |
Cornerstone Bank [Member] |  |  |
Description Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of outstanding common stock acquired |  | 100.00% |
New Jersey State Chartered Banking Institution [Member] |  |  |
Description Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
State in which the entity was incorporated | NJ |  |

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