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Loans - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Allowance for Credit Losses [Roll Forward]      
Beginning Balance $ 44,436 $ 43,765 $ 43,765
Change in Accounting Method (1,674)    
2/1/2025 Acquired Heartland PCD 15,908    
Day 2 CECL Provision - Heartland 16,200    
Provision (Benefit) for Credit Loss Expense 774 900  
Loans Charged-off (625) (1,061)  
Recoveries Collected 139 150  
Total Ending Allowance Balance 75,158 43,754 44,436
Commercial and Industrial Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 7,059 7,921 7,921
Change in Accounting Method 1,438    
2/1/2025 Acquired Heartland PCD 5,246    
Day 2 CECL Provision - Heartland 1,797    
Provision (Benefit) for Credit Loss Expense (75) (556)  
Loans Charged-off (126) (102) (223)
Recoveries Collected 4 3  
Total Ending Allowance Balance 15,343 7,266 7,059
Commercial Real Estate Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 25,818 25,923 25,923
Change in Accounting Method (3,428)    
2/1/2025 Acquired Heartland PCD 7,080    
Day 2 CECL Provision - Heartland 7,522    
Provision (Benefit) for Credit Loss Expense 819 833  
Loans Charged-off 0 (308) (308)
Recoveries Collected 0 4  
Total Ending Allowance Balance 37,811 26,452 25,818
Agricultural Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 4,917 3,837 3,837
Change in Accounting Method (2,860)    
2/1/2025 Acquired Heartland PCD 3,352    
Day 2 CECL Provision - Heartland 170    
Provision (Benefit) for Credit Loss Expense (273) (187)  
Loans Charged-off 0 0 (8)
Recoveries Collected 0 0  
Total Ending Allowance Balance 5,306 3,650 4,917
Leases      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 397 346 346
Change in Accounting Method 720    
2/1/2025 Acquired Heartland PCD 0    
Day 2 CECL Provision - Heartland 0    
Provision (Benefit) for Credit Loss Expense 34 27  
Loans Charged-off 0 0 0
Recoveries Collected 0 0  
Total Ending Allowance Balance 1,151 373 397
Consumer Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 727 759 759
Change in Accounting Method (284)    
2/1/2025 Acquired Heartland PCD 20    
Day 2 CECL Provision - Heartland 179    
Provision (Benefit) for Credit Loss Expense 227 269  
Loans Charged-off (325) (368) (1,511)
Recoveries Collected 113 125  
Total Ending Allowance Balance 657 785 727
Home Equity Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,196 1,834 1,834
Change in Accounting Method 956    
2/1/2025 Acquired Heartland PCD 11    
Day 2 CECL Provision - Heartland 570    
Provision (Benefit) for Credit Loss Expense 208 294  
Loans Charged-off 0 (134) (170)
Recoveries Collected 1 7  
Total Ending Allowance Balance 3,942 2,001 2,196
Credit Cards      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 520 383 383
Change in Accounting Method (4)    
2/1/2025 Acquired Heartland PCD 0    
Day 2 CECL Provision - Heartland 0    
Provision (Benefit) for Credit Loss Expense 245 150  
Loans Charged-off (174) (149)  
Recoveries Collected 21 11  
Total Ending Allowance Balance 608 395 520
Residential Mortgage Loans      
Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,802 2,762 2,762
Change in Accounting Method 1,788    
2/1/2025 Acquired Heartland PCD 199    
Day 2 CECL Provision - Heartland 5,962    
Provision (Benefit) for Credit Loss Expense (411) 70  
Loans Charged-off 0 0 0
Recoveries Collected 0 0  
Total Ending Allowance Balance $ 10,340 $ 2,832 $ 2,802