Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Security	Dec. 31, 2020 USD ($) Security
Net Investment Income [Line Items]
Securities pledged as collateral	$ 410,492	$ 269,075
Number of securities sold | Security	0	0
Unamortized unrealized loss	$ (29,016)	$ (54,836)
Collateralized Mortgage Backed [Member]
Net Investment Income [Line Items]
Number of securities temporarily impaired and unrealized loss position of less than 12 months	7
Available for sale securities, temporarily impaired and unrealized loss position of less than 12 months, fair value	$ 11,900,000
Number of securities temporarily impaired and unrealized loss position of more than 12 months	1
Available for sale securities, temporarily impaired and unrealized loss position of more than 12 months, fair value	$ 12,000,000.0
Municipal Securities [Member]
Net Investment Income [Line Items]
Number of securities temporarily impaired and unrealized loss position of less than 12 months	10
Available for sale securities, temporarily impaired and unrealized loss position of less than 12 months, fair value	$ 8,100,000
Number of securities temporarily impaired and unrealized loss position of more than 12 months	2
Available for sale securities, temporarily impaired and unrealized loss position of more than 12 months, fair value	$ 3,500,000
Subordinated Debt [Member]
Net Investment Income [Line Items]
Number of securities temporarily impaired and unrealized loss position of less than 12 months	11
Available for sale securities, temporarily impaired and unrealized loss position of less than 12 months, fair value	$ 4,700,000
U.S Government Agencies [Member]
Net Investment Income [Line Items]
Number of securities temporarily impaired and unrealized loss position of more than 12 months	9
Available for sale securities, temporarily impaired and unrealized loss position of more than 12 months, fair value	$ 5,400,000