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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Less than 12 Months, Estimated Fair Value | $ 1,711 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 |
Available for Sale, More than 12 Months, Estimated Fair Value | 121 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 |
Available for Sale, Total Estimated Fair Value | 1,832 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 4 | $ 13,577
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Less than 12 Months, Estimated Fair Value | 1,711 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 |
Available for Sale, More than 12 Months, Estimated Fair Value | 121 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 |
Available for Sale, Total Estimated Fair Value | 1,832 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 4 | $ 1,289

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