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Goodwill and Intangible Assets - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
item
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
item
Dec. 31, 2023
USD ($)
Goodwill and Intangible Assets          
Goodwill acquired $ 306,043   $ 306,043   $ 306,043
Goodwill Impairment     $ 0   0
Amortization period for acquired intangible assets     9 years 9 months 18 days    
Mortgage loans serviced     $ 500,000 $ 500,000  
Mortgage service fees 300 $ 600 1,100 1,900  
Loans 7,619,448   7,619,448   7,600,811
Amortization expense $ 1,977 2,008 $ 5,962 5,378  
Core deposit intangible          
Goodwill and Intangible Assets          
Amortization period 10 years   10 years    
Other intangible assets          
Goodwill and Intangible Assets          
Amortization expense $ 2,000 $ 2,000 $ 6,000 5,400  
MSRs          
Goodwill and Intangible Assets          
Amortization expense     $ 356 $ 675  
MSRs | Discount rate | Minimum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.100 0.100 0.100 0.100  
MSRs | Discount rate | Maximum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.105 0.105 0.105 0.105  
MSRs | Constant prepayment speed | Minimum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.069 0.060 0.069 0.060  
MSRs | Constant prepayment speed | Maximum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.176 0.106 0.176 0.106  
Small Business Administration ("SBA") servicing rights          
Goodwill and Intangible Assets          
Fee income $ 100 $ 100 $ 200 $ 700  
Loans $ 129,700   129,700   $ 108,800
Amortization expense     $ 177 $ 104  
Small Business Administration ("SBA") servicing rights | Discount rate          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.097 0.137 0.097 0.137  
Small Business Administration ("SBA") servicing rights | Constant prepayment speed          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.156 0.141 0.156 0.141  
Customer relationship intangible          
Goodwill and Intangible Assets          
Amortization period 10 years   10 years    
Internally developed technology          
Goodwill and Intangible Assets          
Amortization period 5 years   5 years