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Fair Value Measurements (Foreclosed Assets Remeasured and Reported at Fair Value) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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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 | $ 0 | $ 1,348 | $ 2,899
Foreclosed Assets Remeasured at Initial Recognition Charge Offs Recognized In Allowance For Loan Losses | 0 | (76) | 0
Fair Value of Foreclosed Assets Remeasured at Initial Recognition | 0 | 1,272 | 2,899
Foreclosed Assets Remeasured Subsequent to Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement | 328 | 0 | 1,823
Foreclosed Assets Remeasured Subsequent to initial Recognition Write Downs Included In Other Non Interest Expense | (231) | 0 | (473)
Fair Value of Foreclosed Assets Remeasured Subsequent to Initial Recognition | $ 97 | $ 0 | $ 1,350

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