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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 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 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)      
Goodwill $ 50,097   $ 50,100