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Business Combinations - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Mar. 20, 2023
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Assets        
Goodwill   $ 196,461,000 $ 196,461,000  
Blackhawk Bancorp, Inc        
Assets        
Goodwill   $ 50,097,000   $ 50,100,000
Consideration paid        
Consideration payable in cash $ 1,928      
Total consideration paid 93,510,000      
Blackhawk Bancorp, Inc | Fair Value Adjustments        
Assets        
Cash and due from banks 55,600,000      
Loans held for sale 3,222,000      
Loans, net 722,866,000      
Investment securities 377,969,000      
Short-term investments 869,000      
FHLB stock 1,737,000      
Premises and equipment 12,366,000      
Accrued interest receivable 4,029,000      
Prepaid expenses 1,182,000      
Other assets 20,742,000      
Core deposit intangible 34,590,000      
Income tax receivable 2,077,000      
Deferred tax asset 22,152,000      
Mortgage servicing rights 7,031,000      
Total assets acquired 1,266,432,000      
Liabilities        
Deposits 1,194,972,000      
Subordinated and Junior Subordinated debt 16,448,000      
Accrued interest payable 1,091,000      
Accrued and other liabilities 10,508,000      
Total liabilities assumed 1,223,019,000      
Net assets acquired 43,413,000      
Consideration paid        
Total consideration paid 93,510,000      
Goodwill $ 50,097,000