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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
Concentrations of Credit Risk    
CDL Concentration Ratio (as percentage) 59.70% 64.80%
CRE Concentration Ratio (as percentage) 236.50% 249.00%
Concentrations of Credit Risk    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold (as a percent) 25.00%  
Loans. | Concentrations of Credit Risk    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold $ 1,200,000  
Number of credit concentrations for non-acquired credit impaired loans | item 8  
Loans. | Concentrations of Credit Risk | non - real estate    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold $ 1,200,000  
Loans. | Concentrations of Credit Risk | Lessors of nonresidential buildings    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 6,200,000  
Loans. | Concentrations of Credit Risk | Loans on owner occupied office buildings    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 1,900,000  
Loans. | Concentrations of Credit Risk | Other holding companies    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 1,800,000  
Loans. | Concentrations of Credit Risk | Lessors of residential and buildings    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 2,400,000  
Loans. | Concentrations of Credit Risk | Loans secured by jumbo    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 8,800,000  
Amount loaned 726,200  
Loans. | Concentrations of Credit Risk | Residential 1-4 family    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold 2,600,000  
Loans. | Concentrations of Credit Risk | Business assets    
Concentrations of Credit Risk    
Concentration risk threshold, total risk-based capital threshold $ 2,200,000