Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	$ 1,508
Allowance for credit loss, collateral dependent loans	577
Commercial
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	572
Allowance for credit loss, collateral dependent loans	572
Consumer
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	936
Allowance for credit loss, collateral dependent loans	5
Consumer | Real estate first mortgage
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	886
Allowance for credit loss, collateral dependent loans	3
Consumer | Real estate junior lien
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	46
Consumer | Other revolving and installment
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	4
Allowance for credit loss, collateral dependent loans	2
Real Estate
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	1,504
Real Estate | Commercial
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	572
Real Estate | Consumer
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	932
Real Estate | Consumer | Real estate first mortgage
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	886
Real Estate | Consumer | Real estate junior lien
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	46
Other
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	4
Other | Consumer
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	4
Other | Consumer | Other revolving and installment
Loans and Allowance for Loan Losses
Amortized costs, collateral dependent loans	$ 4