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Fair Value Measurements - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually 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 reviewed collectively for amount of impairment | 250,000 |
Impaired loans | Real estate loans | Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 3,500,000 | $ 6,700,000
Impaired loans | Commercial and industrial loans | Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 1,700,000 | $ 1,700,000

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- Definition Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment + References No definition available. + Details
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