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Goodwill and Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 03, 2023
USD ($)
Sep. 30, 2023
USD ($)
item
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
item
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Sep. 01, 2022
Goodwill and Intangible Assets              
Goodwill acquired   $ 306,043,000   $ 306,043,000   $ 279,132,000  
Goodwill Impairment       $ 0   0  
Amortization period for acquired intangible assets       9 years 9 months 18 days      
Mortgage loans serviced       $ 500,000,000 $ 1,000,000,000.0    
Mortgage service fees   600,000 $ 700,000 1,900,000 1,800,000    
Loans   7,384,992,000   7,384,992,000   $ 7,130,916,000  
Amortization expense   $ 2,008,000 383,000 $ 5,378,000 975,000    
Cambr Solutions, LLC ("Cambr")              
Goodwill and Intangible Assets              
Goodwill acquired $ 26,911,000            
Acquired through acquisition 18,000,000.0            
Core deposit intangible              
Goodwill and Intangible Assets              
Amortization period   10 years   10 years     10 years
Core deposit intangible | Cambr Solutions, LLC ("Cambr")              
Goodwill and Intangible Assets              
Acquired through acquisition 1,700,000,000            
Other intangible assets              
Goodwill and Intangible Assets              
Amortization expense   $ 2,000,000.0 $ 400,000 $ 5,400,000 1,000,000.0    
Other intangible assets | Cambr Solutions, LLC ("Cambr")              
Goodwill and Intangible Assets              
Acquired through acquisition $ 18,000,000.0            
Amortization period for acquired intangible assets 9 years 4 months 24 days            
MSRs              
Goodwill and Intangible Assets              
Amortization expense       $ 675,000 $ 713,000    
MSRs | Discount Rate | Minimum              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent)   0.100 0.095 0.100 0.095    
MSRs | Discount Rate | Maximum              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent) | item   0.105   0.105      
MSRs | Constant Prepayment Speed | Minimum              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent)   0.060 0.076 0.060 0.076    
MSRs | Constant Prepayment Speed | Maximum              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent)   0.106 0.078 0.106 0.078    
Small Business Administration ("SBA") servicing rights              
Goodwill and Intangible Assets              
Fee income   $ 100,000   $ 700,000      
Loans   $ 108,200,000   108,200,000      
Amortization expense       $ 104,000      
Small Business Administration ("SBA") servicing rights | Discount Rate              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent)   0.1374   0.1374      
Small Business Administration ("SBA") servicing rights | Constant Prepayment Speed              
Goodwill and Intangible Assets              
Servicing assets measurement input (as a percent)   0.1408   0.1408      
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