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Investments - Summary of Unrealized Losses (Detail) $ in Thousands	Mar. 31, 2021 USD ($) Security	Dec. 31, 2020 USD ($) Security
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	125	36
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 159,462	$ 29,308
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(3,551)	(231)
Available-for-sale Securities, Fair Value, 12 Months or Greater	11,158	10,547
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(196)	(378)
Fair Value, Total	170,620	39,855
Unrealized Losses, Total	$ (3,747)	$ (609)
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	38	6
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 17,258	$ 3,111
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(339)	(68)
Fair Value, Total	17,258	3,111
Unrealized Losses, Total	$ (339)	$ (68)
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	46	1
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 31,377	$ 2,410
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(807)	(91)
Fair Value, Total	31,377	2,410
Unrealized Losses, Total	$ (807)	$ (91)
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	37	22
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 105,822	$ 20,545
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(2,381)	(65)
Available-for-sale Securities, Fair Value, 12 Months or Greater	10,182	8,592
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(171)	(333)
Fair Value, Total	116,004	29,137
Unrealized Losses, Total	$ (2,552)	$ (398)
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Number of Securities | Security	4	7
Available-for-sale Securities, Fair Value, Less Than 12 Months	$ 5,005	$ 3,242
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months	(24)	(7)
Available-for-sale Securities, Fair Value, 12 Months or Greater	976	1,955
Available-for-sale Securities, Unrealized Losses, 12 months or Greater	(25)	(45)
Fair Value, Total	5,981	5,197
Unrealized Losses, Total	$ (49)	$ (52)

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