Investment and Equity Securities - Summary of Amortized Cost of Debt Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Held To Maturity Securities [Line Items]
Total	$ 27,252	$ 28,600
U.S. Government Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total		133
State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	12,252	$ 13,467
Corporate Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	15,000
Aa1/Aa2/Aa3
Schedule Of Held To Maturity Securities [Line Items]
Total	12,252
Aa1/Aa2/Aa3 | State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	12,252
Not rated
Schedule Of Held To Maturity Securities [Line Items]
Total	15,000
Not rated | Corporate Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Total	$ 15,000