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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2023
Less purchase accounting adjustments:        
Goodwill $ 203,391     $ 196,461
Purdum, Gray, Ingledue, Beck, Inc.        
Goodwill [Line Items]        
Unallocated purchase price     $ 10,145  
Less purchase accounting adjustments:        
Insurance Company intangible     5,770  
Other liabilities     (1,576)  
Goodwill, purchase accounting adjustments     4,194  
Goodwill     $ 5,951  
Mid Rivers        
Goodwill [Line Items]        
Unallocated purchase price 10,059      
Less purchase accounting adjustments:        
Insurance Company intangible 4,305      
Other liabilities (1,176)      
Goodwill, purchase accounting adjustments 3,129      
Goodwill $ 6,930      
Blackhawk Bancorp, Inc        
Goodwill [Line Items]        
Unallocated purchase price   $ 26,955    
Less purchase accounting adjustments:        
Fair value of securities   (25,521)    
Fair value of loans, net   (43,477)    
Fair value of premises and equipment   (3,856)    
Fair value of time deposits   2,311    
Fair value of subordinated and junior subordinated debentures   3,707    
Increase in core deposit intangible   33,731    
Increase in mortgage servicing rights   3,344    
Other assets   6,619    
Goodwill, purchase accounting adjustments   (23,142)    
Goodwill   $ 50,097