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Investment Securities - (ASU 2016-13 Adoption Impact) (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses | $ (76) | $ 70 | $ 0
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | 70 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | 70 |
Corporate Obligations |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses | $ (9) |  | 0
Corporate Obligations | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | 6 |
Corporate Obligations | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | 6 |
Municipal Notes |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  |  | $ 0
Municipal Notes | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | 64 |
Municipal Notes | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses |  | $ 64 |

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