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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 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 | $ 42,964 | $ 4,648
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 852 | 5
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 42,964 | 4,648
Available-for Sale, Gross Unrealized Losses, Total | 852 | 5
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 21,199 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 402 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 21,199 |
Available-for Sale, Gross Unrealized Losses, Total | 402 |
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 8,678 | 2,515
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 180 | 3
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 8,678 | 2,515
Available-for Sale, Gross Unrealized Losses, Total | 180 | 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 | 1,595 | 2,133
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 8 | 2
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 1,595 | 2,133
Available-for Sale, Gross Unrealized Losses, Total | 8 | $ 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 | 11,492 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 262 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 11,492 |
Available-for Sale, Gross Unrealized Losses, Total | $ 262 |

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