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Business Combinations - Narrative (Details)
 3 Months Ended 9 Months Ended
Feb. 01, 2025
USD ($)
bankingOffice
$ / shares
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Combination [Line Items]                
Assets   $ 8,401,248,000 $ 8,401,248,000   $ 6,295,910,000      
Loans   5,702,448,000 5,702,448,000   4,080,466,000      
Deposits   7,014,502,000 7,014,502,000   5,329,075,000      
Increase in depreciation expense $ 152,000              
Goodwill   375,237,000 375,237,000   179,025,000      
Acquired loan balance   1,432,273,000 1,432,273,000          
Allowance for credit losses   76,057,000 76,057,000 $ 76,105,000 $ 44,436,000 $ 44,124,000 $ 43,946,000 $ 43,765,000
Heartland BancCorp                
Business Combination [Line Items]                
Number of banking offices | bankingOffice 20              
Assets $ 1,940,000,000              
Loans 1,580,000,000              
Deposits 1,730,000,000              
Increase in fair value of property 1,664,000              
Direct acquisition costs 23,060,000              
Goodwill 196,212,000              
Intangible assets 40,065,000              
Goodwill deductible for tax purposes 0              
Cash paid for acquisition 23,102,000              
Fair value of non-impaired loans and customers receivables acquired 1,503,378,000              
Acquired loan balance 1,569,036,000              
Non-recurring merger costs excluded from pro forma information   135,000 6,996,000          
Allowance for credit losses   $ 16,200,000 $ 16,200,000          
Heartland BancCorp | PCD Loans                
Business Combination [Line Items]                
Fair value of non-impaired loans and customers receivables acquired 91,377,000              
Acquired loan balance 112,839,000              
Estimated contractual cash flows of purchased financial asset with credit deterioration $ 16,503,000              
Heartland BancCorp | Common Stock                
Business Combination [Line Items]                
Share price (in dollars per share) | $ / shares $ 3.90              
Shares issued for acquisition (in shares) | shares 7,742,723              
Heartland BancCorp | Synergies and Cost Savings                
Business Combination [Line Items]                
Goodwill $ 196,212,000              
Heartland BancCorp | Core Deposits                
Business Combination [Line Items]                
Intangible assets $ 40,065,000              
Weighted average useful live of acquired intangibles (in years) 8 years