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Business Combinations - Narrative (Details)
 3 Months Ended
Feb. 01, 2025
USD ($)
banking_office
$ / shares
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]          
Assets   $ 8,419,693,000 $ 6,295,910,000    
Loans   5,571,368,000 4,080,466,000    
Deposits   7,097,885,000 5,329,075,000    
Goodwill   376,507,000 179,025,000    
Acquired loan balance   1,507,751,000      
Allowance for credit losses   75,158,000 $ 44,436,000 $ 43,754,000 $ 43,765,000
Heartland BancCorp          
Business Acquisition [Line Items]          
Number of banking offices | banking_office 20        
Assets $ 1,940,000,000        
Loans 1,580,000,000        
Deposits 1,730,000,000        
Direct acquisition costs 22,132,000        
Goodwill 197,482,000        
Intangible assets 40,065,000        
Goodwill deductible for tax purposes 0        
Cash paid for acquisition 23,102,000        
Non-recurring merger costs excluded from pro forma information   5,932,000      
Heartland BancCorp | Synergies and cost savings          
Business Acquisition [Line Items]          
Goodwill 197,482,000        
Heartland BancCorp | Adjustment          
Business Acquisition [Line Items]          
Allowance for credit losses   $ 16,200,000      
Heartland BancCorp | PCD Loans          
Business Acquisition [Line Items]          
Fair value of non-impaired loans and customers receivables acquired 78,478,000        
Acquired loan balance 100,836,000        
Estimated contractual cash flows of purchased financial asset with credit deterioration $ 15,908,000        
Heartland BancCorp | Common stock          
Business Acquisition [Line Items]          
Share price (in dollars per share) | $ / shares $ 3.90        
Shares issued for acquisition (in shares) | shares 7,742,723        
Heartland BancCorp | Core Deposits          
Business Acquisition [Line Items]          
Intangible assets $ 40,065,000        
Weighted average useful live of acquired intangibles (in years) 8 years