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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Non-recurring Basis - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized losses impaired loans | $ 1,184 | $ 2,730
Unrealized losses other real estate owned | 0 | 0
Quoted Prices in Active Markets for Identical Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 0 | 0
Other real estate owned | 0 | 0
Significant Observable Inputs with No Active Market with Identical Characteristics |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 3,253 | 6,121
Other real estate owned | 663 | 1,946
Significant Unobservable Inputs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 1,957 | 2,436
Other real estate owned | $ 0 | $ 0

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