| Fair Value Measurements - Additional Information (Detail) | Sep. 30, 2023  USD ($) | 
|---|---|
| Minimum | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Unpaid principal balance of Non-accrual Non-PCI loans individually evaluated for amount of impairment | $ 250,000 | 
| Maximum | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Unpaid principal balance of Non-accrual Non-PCI loans and leases reviewed collectively | $ 250,000 | 
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- Definition Impaired Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment No definition available. 
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| X | ||||||||||
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- Definition Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment No definition available. 
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| X | ||||||||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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