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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 20, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Finite Lived Intangible Assets [Line Items]            
Goodwill, net         $ 203,391 $ 196,461
Principal balance of mortgage loans serviced for others         $ 572,600 $ 641,200
Weighted average amortization period of intangibles         3 years 7 months 2 days  
Core Deposit Intangibles            
Finite Lived Intangible Assets [Line Items]            
Weighted average amortization period of intangibles         3 years 2 months 12 days  
Customer List Intangibles            
Finite Lived Intangible Assets [Line Items]            
Weighted average amortization period of intangibles         4 years 4 months 13 days  
Mid Rivers            
Finite Lived Intangible Assets [Line Items]            
Goodwill acquired during period   $ 6,900        
Goodwill, net   $ 6,930        
Blackhawk Bancorp, Inc            
Finite Lived Intangible Assets [Line Items]            
Goodwill acquired during period $ 50,100   $ 50,100      
Goodwill, net     $ 50,097      
Purdum, Gray, Ingledue, Beck, Inc.            
Finite Lived Intangible Assets [Line Items]            
Goodwill acquired during period       $ 6,000    
Goodwill, net       $ 5,951