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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2022
Less purchase accounting adjustments:          
Resulting goodwill from acquisition $ 196,461     $ 140,412  
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 jr 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)        
Resulting goodwill from acquisition 50,097 $ 50,100      
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        
Resulting goodwill from acquisition 5,951   $ 6,000    
Delta Bancshares Company          
Goodwill [Line Items]          
Unallocated purchase price 29,791        
Less purchase accounting adjustments:          
Fair value of securities (2,836)        
Fair value of loans, net (3,399)        
Fair value of premises and equipment 3,508        
Fair value of time deposits (1,759)        
Fair value of FHLB advances (75)        
Core deposit intangible 5,920        
Other assets (570)        
Other liabilities 444        
Goodwill, purchase accounting adjustments 1,233        
Resulting goodwill from acquisition $ 28,558       $ 28,600