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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unrealized losses impaired loans | $ 2,973 | $ 456 |
Unrealized losses other real estate owned | 0 | $ 0 |
Impaired loans | Real estate loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 3,000 |  | $ 3,500
Impaired loans | Commercial and industrial loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 18,700 |  | 1,700
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 | 2,923 |  | 3,253
Other real estate owned | 622 |  | 663
Significant Unobservable Inputs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 18,720 |  | 1,957
Other real estate owned | $ 0 |  | $ 0

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