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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
ALLOWANCE FOR CREDIT LOSSES:          
Provision for credit losses-off balance sheet credit exposures $ (267) $ (76) $ (551) $ (143)  
Cumulative Effect, Period of Adoption, Adjustment [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Accounting Standards Update [Extensible Enumeration]       Accounting Standards Update 2016-13 [Member] Accounting Standards Update 2016-13 [Member]
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year 1,928 2,099 2,212 $ 1,262 $ 1,262
Provision for credit losses-off balance sheet credit exposures (267) (76) (551) (143) 46
Balance at ending of year $ 1,661 $ 2,023 $ 1,661 2,023 2,212
Unfunded Loan Commitment & Letters of Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year       $ 904 $ 904