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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
contract
loan
Mar. 31, 2021
USD ($)
contract
Dec. 31, 2021
USD ($)
Troubled debt restructuring modifications      
Number of Contracts | contract 144 1,719  
Recorded Investment $ 1,759 $ 24,340  
Related ACL 202 $ 14,196  
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,700,000   $ 6,700,000
Commitments related to borrowers who had loan terms modified in a TDR $ 100   200
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 143 97  
Recorded Investment, Defaulted TDRs $ 2,207 $ 2,198  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract   17  
Recorded Investment   $ 2,945  
Related ACL   $ 1,648  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 1 2  
Recorded Investment, Defaulted TDRs $ 216 $ 397  
Consumer      
Troubled debt restructuring modifications      
Number of Contracts | contract 144 1,690  
Recorded Investment $ 1,759 $ 15,763  
Related ACL $ 202 $ 11,832  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract 142 93  
Recorded Investment, Defaulted TDRs $ 1,991 $ 1,068  
Construction      
Troubled debt restructuring modifications      
Number of Contracts | contract   2  
Recorded Investment   $ 716  
Related ACL   $ 342  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract   1  
Recorded Investment, Defaulted TDRs   $ 361  
Residential Mortgage.      
Troubled debt restructuring modifications      
Number of Contracts | contract   10  
Recorded Investment   $ 4,916  
Related ACL   $ 374  
Loans modified in TDRs that experienced a payment default      
Number of Contracts, Defaulted TDRs | contract   1  
Recorded Investment, Defaulted TDRs   $ 372  
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure $ 300   300
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    
Real estate property held from a foreclosed TDR     200
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 6,546,389   6,490,301
Standby letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 182,423   182,447
Commercial letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 7,149   $ 3,307