Investment and Equity Securities - Summary of Amortized Cost of Debt Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Held To Maturity Securities [Line Items]
Total	$ 29,227	$ 30,306
U.S. Government Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	143	152
State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	14,084	$ 15,154
Corporate Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	15,000
Aaa
Schedule Of Held To Maturity Securities [Line Items]
Total	1,173
Aaa | State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	1,173
Aa1/Aa2/Aa3
Schedule Of Held To Maturity Securities [Line Items]
Total	12,911
Aa1/Aa2/Aa3 | State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	12,911
Not rated
Schedule Of Held To Maturity Securities [Line Items]
Total	15,143
Not rated | U.S. Government Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	143
Not rated | Corporate Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	$ 15,000