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Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans $ 4,597 $ 6,435
Equipment    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 1,727 1,926
Other    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 135 155
Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 6,459 8,516
Allowance for credit loss 1,289 1,287
Residential portfolio segment | 1-4 Family Residential Mortgage | Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 1,697 1,613
Residential portfolio segment | 1-4 Family Residential Mortgage | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 1,697 1,613
Residential portfolio segment | Home Equity And Second Mortgage | Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 508 714
Residential portfolio segment | Home Equity And Second Mortgage | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 508 714
Residential portfolio segment | 1-4 Family Residential Construction | Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 93 90
Residential portfolio segment | 1-4 Family Residential Construction | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 93 90
Allowance for credit loss 56 54
Construction | Other Construction, Development and Land | Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 115 106
Construction | Other Construction, Development and Land | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 115 106
Commercial portfolio segment | Commercial Real Estate | Real Estate    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 2,184 3,912
Commercial portfolio segment | Commercial Real Estate | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 2,184 3,912
Commercial portfolio segment | Commercial Business | Equipment    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 1,727 1,926
Commercial portfolio segment | Commercial Business | Other    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 135 155
Commercial portfolio segment | Commercial Business | Collateral Pledged    
Loans and Allowance for Credit Losses    
Amortized cost basis of, and ACL allocation to, individually evaluated collateral-dependent loans 1,862 2,081
Allowance for credit loss $ 1,233 $ 1,233