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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Parenthetical) (Detail) | Sep. 30, 2025 USD ($) Borrower | Dec. 31, 2024 USD ($) Borrower
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Number of borrowers with loan balance greater than one million | Borrower | 12 | 6
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower | $ 1,000,000 | $ 1,000,000
Borrowers with large amount of loans outstanding, net | 42,500,000 | 13,100,000
Non-accrual loans | 94,463,000 | $ 39,752,000
Premier Financial Corporation [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 20,800,000 |

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