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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	$ 240,770	$ 67,825
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	12,388	657
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	240,770	67,825
Available-for Sale, Gross Unrealized Losses, Total	12,388	657
States and Political Subdivisions [Member]
Marketable Securities [Line Items]
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	124,916	23,465
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	6,933	240
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	124,916	23,465
Available-for Sale, Gross Unrealized Losses, Total	6,933	240
Corporate Bonds [Member]
Marketable Securities [Line Items]
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	95,865	36,443
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	4,155	272
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	95,865	36,443
Available-for Sale, Gross Unrealized Losses, Total	4,155	272
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	6,248	1,146
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	307	13
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	6,248	1,146
Available-for Sale, Gross Unrealized Losses, Total	307	13
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	13,741	6,771
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	993	132
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	13,741	6,771
Available-for Sale, Gross Unrealized Losses, Total	$ 993	$ 132

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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