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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | $ 26,654 | $ 4,648
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 290 | 5
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 26,654 | 4,648
Available-for Sale, Gross Unrealized Losses, Total | 290 | 5
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 6,992 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 105 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 6,992 |
Available-for Sale, Gross Unrealized Losses, Total | 105 |
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 11,504 | 2,515
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 99 | 3
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 11,504 | 2,515
Available-for Sale, Gross Unrealized Losses, Total | 99 | 3
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 1,337 | 2,133
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 9 | 2
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 1,337 | 2,133
Available-for Sale, Gross Unrealized Losses, Total | 9 | $ 2
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 6,821 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 77 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 6,821 |
Available-for Sale, Gross Unrealized Losses, Total | $ 77 |

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