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Allowance for Credit Losses - Loan Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 7,014    
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,500,000 $ 7,000,000 $ 6,700,000
Commitments related to borrowers experiencing financial difficulty   $ 100 $ 200
30 - 59 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 107    
60 - 89 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 70    
90 Days or Greater Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 15    
Total Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 192    
Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 6,822    
Commercial and Industrial      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 524    
Commercial and Industrial | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 524    
Construction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 665    
Construction | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 665    
Commercial Real Estate      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 3,119    
Commercial Real Estate | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 3,119    
Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 1,410    
Residential mortgage | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 1,410    
Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 1,296    
Consumer | 30 - 59 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 107    
Consumer | 60 - 89 Days Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 70    
Consumer | 90 Days or Greater Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 15    
Consumer | Total Past Due      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 192    
Consumer | Current      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis 1,104    
Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 1,166    
% of Total Class of Financing Receivable 0.01%    
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 318    
Interest Rate Reduction | Commercial Real Estate      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 5    
Reduced weighted-average contractual interest rate 0.75%    
Interest Rate Reduction | Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 1,161    
% of Total Class of Financing Receivable 0.10%    
Reduced weighted-average contractual interest rate 13.01%    
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 318    
Term Extension      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 5,848    
% of Total Class of Financing Receivable 0.04%    
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 6    
Term Extension | Commercial and Industrial      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 524    
% of Total Class of Financing Receivable 0.02%    
Added weighted-average years to the life of loans 2 years 1 month 6 days    
Term Extension | Construction      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 665    
% of Total Class of Financing Receivable 0.07%    
Added weighted-average years to the life of loans 1 year    
Term Extension | Commercial Real Estate      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 3,114    
% of Total Class of Financing Receivable 0.07%    
Added weighted-average years to the life of loans 2 years 1 month 6 days    
Term Extension | Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 1,410    
% of Total Class of Financing Receivable 0.03%    
Added weighted-average years to the life of loans 2 years 1 month 6 days    
Term Extension | Consumer      
Financing Receivable, Modifications [Line Items]      
Amortized Cost Basis $ 135    
% of Total Class of Financing Receivable 0.01%    
Added weighted-average years to the life of loans 3 years 9 months 18 days    
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 6    
Combination - Interest Rate Reduction and Term Extension      
Financing Receivable, Modifications [Line Items]      
Commitments related to borrowers experiencing financial difficulty $ 5,000,000