Investment Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) Securities	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Securities	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Marketable Securities [Line Items]
Number of securities less than 12 months | Securities	65		65
Number of securities more than 12 months | Securities	129		129
Unrealized losses securities more than 12 months	$ 10,916,000		$ 10,916,000		$ 6,370,000
Other than temporary impairment charges	0	$ 0	0	$ 0
Sales of available-for-sale securities				0
Proceeds from maturities of securities available-for-sale	525,000		830,000	$ 3,002,000
Securities pledged as collateral	$ 0		$ 0		0
Number of investment securities | Securities	219		219
Municpal Securities [Member]
Marketable Securities [Line Items]
Number of securities more than 12 months | Securities	81		81
Unrealized losses securities more than 12 months	$ 23,800,000		$ 23,800,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 3,400,000		$ 3,400,000
Mortgage-backed securities [Member]
Marketable Securities [Line Items]
Number of securities more than 12 months | Securities	44		44
Unrealized losses securities more than 12 months	$ 31,500,000		$ 31,500,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,400,000		6,400,000
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Unrealized losses securities more than 12 months	3,412,000		3,412,000		$ 371,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0		$ 0
Agency Securities [Member]
Marketable Securities [Line Items]
Number of securities more than 12 months | Securities	4		4
Unrealized losses securities more than 12 months	$ 5,200,000		$ 5,200,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,100,000		$ 1,100,000