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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
loan
Dec. 31, 2019
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 1,689 5 3
Recorded Investment $ 23,765 $ 7,795 $ 1,180
Related ACL 2,605 590 $ 25
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,700,000 6,100,000  
Commitments related to borrowers who had loan terms modified in a TDR $ 200 $ 200  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 414 1 2
Recorded Investment, Defaulted TDRs $ 7,659 $ 500 $ 571
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 11 1 2
Recorded Investment $ 1,481 $ 500 $ 571
Related ACL $ 124 $ 30 $ 25
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 3 1 2
Recorded Investment, Defaulted TDRs $ 569 $ 500 $ 571
Commercial real estate      
Troubled debt restructuring modifications      
Number of Contracts | contract 1 3  
Recorded Investment $ 346 $ 6,470  
Related ACL $ 78 $ 470  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 1    
Recorded Investment, Defaulted TDRs $ 356    
Residential Mortgage      
Troubled debt restructuring modifications      
Number of Contracts | contract   1 1
Recorded Investment   $ 825 $ 609
Related ACL   $ 90  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 4    
Recorded Investment, Defaulted TDRs $ 1,012    
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure 300    
Residential Mortgage | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Real estate property held from a foreclosed TDR $ 200    
Consumer      
Troubled debt restructuring modifications      
Number of Contracts | contract 1,652    
Recorded Investment $ 15,710    
Related ACL $ 2,127    
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 405    
Recorded Investment, Defaulted TDRs $ 5,272    
Construction      
Troubled debt restructuring modifications      
Number of Contracts | contract 12    
Recorded Investment $ 689    
Related ACL $ 69    
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 1    
Recorded Investment, Defaulted TDRs $ 450    
Residential Mortgage.      
Troubled debt restructuring modifications      
Number of Contracts | contract 13    
Recorded Investment $ 5,539    
Related ACL 207    
Residential Mortgage. | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | loan   0  
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,490,301 $ 5,934,535  
Standby letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 182,447 185,108  
Commercial letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 3,307 $ 3,834