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Goodwill and Intangible Assets - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
item
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
item
Dec. 31, 2024
USD ($)
Goodwill and Intangible Assets          
Goodwill acquired $ 306,043   $ 306,043   $ 306,043
Goodwill Impairment 0   $ 0   0
Amortization period for acquired intangible assets     9 years 9 months 18 days    
Amortization of acquired identifiable intangibles 1,946 $ 1,977 $ 5,870 $ 5,962  
Mortgage loans serviced     300,000 500,000  
Mortgage service fees 200 300 800 1,100  
Loans $ 7,341,221   $ 7,341,221   7,656,688
Core deposit intangible          
Goodwill and Intangible Assets          
Amortization period 10 years   10 years    
Other intangible assets          
Goodwill and Intangible Assets          
Amortization of acquired identifiable intangibles $ 1,900 $ 2,000 $ 5,900 6,000  
MSRs          
Goodwill and Intangible Assets          
Amortization of acquired identifiable intangibles     $ 314 $ 356  
MSRs | Discount rate | Minimum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.095 0.10 0.095 0.10  
MSRs | Discount rate | Maximum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.10 0.105 0.10 0.105  
MSRs | Constant prepayment speed | Minimum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.066 0.069 0.066 0.069  
MSRs | Constant prepayment speed | Maximum          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.124 0.176 0.124 0.176  
Small Business Administration ("SBA") servicing rights          
Goodwill and Intangible Assets          
Amortization of acquired identifiable intangibles     $ 251 $ 177  
Loans $ 131,800   131,800   $ 132,000
Fee income $ 200 $ 100 $ 500 $ 200  
Small Business Administration ("SBA") servicing rights | Discount rate          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.108 0.097 0.108 0.097  
Small Business Administration ("SBA") servicing rights | Constant prepayment speed          
Goodwill and Intangible Assets          
Servicing assets measurement input (as a percent) 0.161 0.156 0.161 0.156  
Customer relationship intangible          
Goodwill and Intangible Assets          
Amortization period 10 years   10 years    
Acquired technology intangible          
Goodwill and Intangible Assets          
Amortization period 5 years   5 years