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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | $ 87,828 | $ 175,099
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 3,293 | 7,984
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 126,895 | 60,615
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 8,578 | 4,637
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 214,723 | 235,714
Available-for Sale, Gross Unrealized Losses, Total | 11,871 | 12,621
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 74,676 | 100,190
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 3,173 | 5,748
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 70,884 | 27,446
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 6,419 | 2,682
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 145,560 | 127,636
Available-for Sale, Gross Unrealized Losses, Total | 9,592 | 8,430
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 13,152 | 71,069
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 120 | 1,790
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 37,848 | 19,000
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,156 | 993
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 51,000 | 90,069
Available-for Sale, Gross Unrealized Losses, Total | 1,276 | 2,783
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 | 0 | 3,840
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 0 | 446
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 3,888 | 219
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 377 | 40
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 3,888 | 4,059
Available-for Sale, Gross Unrealized Losses, Total | 377 | 486
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 | 0 | 0
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 0 | 0
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 14,275 | 13,950
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 626 | 922
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 14,275 | 13,950
Available-for Sale, Gross Unrealized Losses, Total | $ 626 | $ 922

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