Annual report [Section 13 and 15(d), not S-K Item 405]

Securities - Additional Information (Detail)

v3.25.0.1
Securities - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of securities $ 0 $ 8,149,000 $ 0
Net gains (loss) in earnings resulting from sale of securities   (1,871,000)  
Net unrealized gains (losses) recorded in comprehensive income   (1,700,000)  
Available for sale securities pledged as collateral $ 29,400,000 $ 24,800,000  
Minimum | U.S. Government and its Agencies      
Debt Securities, Available-for-sale [Line Items]      
Holdings of securities as percentage of share holders' equity 10.00%