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Investments - Summary of Unrealized Losses (Detail) $ in Thousands	Jun. 30, 2021 USD ($) Security	Dec. 31, 2020 USD ($) Security
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	115	36
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 148,558	$ 29,308
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(3,021)	(231)
Available-for-sale Securities, Fair Value, 12 Months or Greater	1,219	10,547
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(11)	(378)
Fair Value, Total	149,777	39,855
Unrealized Losses, Total	$ (3,032)	$ (609)
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	30	6
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 14,681	$ 3,111
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(108)	(68)
Fair Value, Total	14,681	3,111
Unrealized Losses, Total	$ (108)	$ (68)
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	13	1
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 20,368	$ 2,410
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(543)	(91)
Fair Value, Total	20,368	2,410
Unrealized Losses, Total	$ (543)	$ (91)
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	64	22
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 109,559	$ 20,545
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(2,254)	(65)
Available-for-sale Securities, Fair Value, 12 Months or Greater	1,219	8,592
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(11)	(333)
Fair Value, Total	110,778	29,137
Unrealized Losses, Total	$ (2,265)	$ (398)
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	8	7
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 3,950	$ 3,242
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(116)	(7)
Available-for-sale Securities, Fair Value, 12 Months or Greater		1,955
Available-for-sale Securities, Unrealized Losses, 12 months or Greater		(45)
Fair Value, Total	3,950	5,197
Unrealized Losses, Total	$ (116)	$ (52)

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