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Allowance for Credit Losses - Loan Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   $ 3,411  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted   186  
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 7,000,000 7,000,000 $ 7,000,000
Commitments related to borrowers experiencing financial difficulty     $ 100
30 - 59 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   62  
60 - 89 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   18  
90 Days or Greater Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   18  
Total Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   98  
Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   3,313  
Commercial and Industrial      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   248  
Commercial and Industrial | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   248  
Construction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   897  
Construction | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   897  
Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   1,214  
Commercial real estate | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   1,214  
Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   33  
Residential mortgage | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   33  
Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   1,019  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted   186  
Consumer | 30 - 59 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   62  
Consumer | 60 - 89 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   18  
Consumer | 90 Days or Greater Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   18  
Consumer | Total Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   98  
Consumer | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   921  
Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 255 $ 889  
% of Total Class of Financing Receivable   0.01%  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted 166    
Interest Rate Reduction | Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 255 $ 889  
% of Total Class of Financing Receivable 0.02% 0.08%  
Reduced weighted-average contractual interest rate 13.31% 13.22%  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 166    
Term Extension      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 831 $ 2,522  
% of Total Class of Financing Receivable 0.01% 0.02%  
Term Extension | Commercial and Industrial      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 145 $ 248  
% of Total Class of Financing Receivable 0.01% 0.01%  
Added weighted-average years to the life of loans 2 years 7 months 6 days 3 years  
Term Extension | Construction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 669 $ 897  
% of Total Class of Financing Receivable 0.08% 0.10%  
Added weighted-average years to the life of loans 1 year 1 year 4 months 24 days  
Term Extension | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   $ 1,214  
% of Total Class of Financing Receivable   0.03%  
Added weighted-average years to the life of loans 0 years 1 year  
Term Extension | Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis   $ 33  
Added weighted-average years to the life of loans 0 years 3 years 7 months 6 days  
Term Extension | Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 17 $ 130  
% of Total Class of Financing Receivable   0.01%  
Combination - Interest Rate Reduction and Term Extension      
Financing Receivable, Modifications [Line Items]      
Commitments related to borrowers experiencing financial difficulty $ 5,000 $ 5,000