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Fair Value Measurements (Foreclosed Assets Remeasured and Reported at Fair Value) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreclosed Assets Remeasured at Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement | $ 279 | $ 756 | $ 1,102
Foreclosed Assets Remeasured at Initial Recognition Charge Offs Recognized In Allowance For Loan Losses | 0 | (3) | (169)
Fair Value of Foreclosed Assets Remeasured at Initial Recognition | 279 | 753 | 933
Foreclosed Assets Remeasured Subsequent to Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement | 89 | 492 | 205
Foreclosed Assets Remeasured Subsequent to initial Recognition Write Downs Included In Other Non Interest Expense | (16) | (217) | (36)
Fair Value of Foreclosed Assets remeasured subsequent to initial recognition | $ 73 | $ 275 | $ 169

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