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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
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Less purchase accounting adjustments:      
Goodwill $ 196,461 $ 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   $ 6,000
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 subordinated and jr subordinated debentures 3,707    
Fair value of time deposits 2,311    
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