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Business Combinations - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Mar. 20, 2023
Feb. 14, 2022
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Assets          
Goodwill     $ 196,461,000   $ 140,412,000
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 20,703,000        
Core deposit intangible 34,590,000        
Income tax receivable 2,077,000        
Deferred tax asset 22,152,000        
Mortgage servicing rights 7,070,000        
Total assets acquired 1,266,432,000        
Liabilities          
Deposits 1,194,972,000        
Subordinated and jr. 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        
Delta Bancshare Company          
Assets          
Cash and due from banks   $ 82,473,000      
Loans, net   418,509,000      
Investment securities   182,123,000      
Premises and equipment   9,030,000      
Other assets   7,774,000      
Allowance for credit losses   (863,000)      
Goodwill   28,558,000      
Total assets acquired   750,063,000      
Liabilities          
Deposits   560,378,000      
Securities sold under agreements to repurchase   35,523,000      
FHLB advances   45,075,000      
Lease liability   717,000      
Other liabilities   1,048,000      
Total liabilities assumed   642,741,000      
Net assets acquired   107,322,000      
Consideration paid          
Consideration payable in cash   15,150,000      
Common stock   92,172,000      
Total consideration paid   107,322,000      
Delta Bancshare Company | Core Deposit Intangibles          
Assets          
Intangible assets   5,920,000      
Delta Bancshare Company | Bank Owned Life Insurance          
Assets          
Intangible assets   15,822,000      
Delta Bancshare Company | Right of Use Asset          
Assets          
Intangible assets   717,000      
Delta Bancshare Company | Acquired Book Value          
Assets          
Cash and due from banks   82,473,000      
Loans, net   426,433,000      
Investment securities   184,959,000      
Premises and equipment   5,522,000      
Other assets   9,061,000      
Allowance for credit losses   (5,388,000)      
Goodwill   14,000      
Total assets acquired   718,896,000      
Liabilities          
Deposits   558,619,000      
Securities sold under agreements to repurchase   35,523,000      
FHLB advances   45,000,000      
Lease liability   0      
Other liabilities   2,209,000      
Total liabilities assumed   641,351,000      
Net assets acquired   77,545,000      
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles          
Assets          
Intangible assets   0      
Delta Bancshare Company | Acquired Book Value | Bank Owned Life Insurance          
Assets          
Intangible assets   15,822,000      
Delta Bancshare Company | Acquired Book Value | Right of Use Asset          
Assets          
Intangible assets   0      
Delta Bancshare Company | Fair Value Adjustments          
Assets          
Cash and due from banks   0      
Loans, net   (7,924,000)      
Investment securities   (2,836,000)      
Premises and equipment   3,508,000      
Other assets   (1,287,000)      
Allowance for credit losses   4,525,000      
Goodwill   28,544,000      
Total assets acquired   31,167,000      
Liabilities          
Deposits   1,759,000      
Securities sold under agreements to repurchase   0      
FHLB advances   75,000      
Lease liability   717,000      
Other liabilities   (1,161,000)      
Total liabilities assumed   1,390,000      
Net assets acquired   29,777,000      
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles          
Assets          
Intangible assets   5,920,000      
Delta Bancshare Company | Fair Value Adjustments | Bank Owned Life Insurance          
Assets          
Intangible assets   0      
Delta Bancshare Company | Fair Value Adjustments | Right of Use Asset          
Assets          
Intangible assets   $ 717,000