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Investments - Summary of Unrealized Losses (Detail) $ in Thousands	Sep. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	221	125
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 128,201	$ 285,666
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(16,182)	(6,714)
Available-for-sale Securities, Fair Value, 12 Months or Greater	208,282	1,539
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(47,091)	(8)
Fair Value, Total	336,483	287,205
Unrealized Losses, Total	$ (63,273)	$ (6,722)
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	85	38
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 31,675	$ 27,905
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(5,226)	(530)
Available-for-sale Securities, Fair Value, 12 Months or Greater	18,772
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(4,372)
Fair Value, Total	50,447	27,905
Unrealized Losses, Total	$ (9,598)	$ (530)
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	23	22
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 17,366	$ 64,067
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(3,018)	(1,614)
Available-for-sale Securities, Fair Value, 12 Months or Greater	42,713
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(8,938)
Fair Value, Total	60,079	64,067
Unrealized Losses, Total	$ (11,956)	$ (1,614)
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	85	54
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 56,101	$ 186,924
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(5,940)	(4,257)
Available-for-sale Securities, Fair Value, 12 Months or Greater	142,728	543
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(33,275)	(4)
Fair Value, Total	198,829	187,467
Unrealized Losses, Total	$ (39,215)	$ (4,261)
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	28	11
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 23,059	$ 6,770
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(1,998)	(313)
Available-for-sale Securities, Fair Value, 12 Months or Greater	4,069	996
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(506)	(4)
Fair Value, Total	27,128	7,766
Unrealized Losses, Total	$ (2,504)	$ (317)

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