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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
Allowance for credit loss, increase   $ 15.3  
Allowance for credit loss, increase, percent   18.30%  
Allowance for credit loss, percent of total loans 1.40% 1.40% 1.22%
Additional reserve requirements for charge-offs and credit quality $ 7.6 $ 36.3  
Additional reserve requirements due to loan composition and volume changes 1.4    
Updated economic factors 0.4 9.6  
Release due to recoveries $ 1.2    
Account for loan growth   2.3  
Commercial Real Estate And Commercial Portfolio Segments Member      
Financing Receivable, Credit Quality Indicator [Line Items]      
Internal risk ratings, loan balance, minimum   3.0  
Real estate loans | Single-family residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
Internal risk ratings, loan balance, minimum   $ 3.0  
Real estate loans | Owner occupied | Commercial Real Estate | Collateralized Loan Obligations      
Financing Receivable, Credit Quality Indicator [Line Items]      
Decrease in weighted-average loan-to-values   2.00%