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Loans and Leases, Components of Loans and Leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Loan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases $ 3,247,911 $ 3,111,533    
Unearned income (10,734) (11,941)    
Total net loans and leases 3,237,177 3,099,592    
Allowance for credit losses (61,007) (58,862) $ (55,012) $ (55,266)
Loans held for investment, net 3,176,170 3,040,730    
Collateral on borrowing lines 767,000      
Maximum borrowing capacity 1,400,000 1,300,000    
Federal Home Loan Bank [Member]        
Loan & Lease Portfolio [Abstract]        
Collateral on borrowing lines 1,100,000      
Maximum borrowing capacity 837,100      
Federal Reserve Bank [Member]        
Loan & Lease Portfolio [Abstract]        
Collateral on borrowing lines 767,000      
Maximum borrowing capacity 480,400      
Paycheck Protection Program [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 70,800 224,300    
Loans funded for the small business customers $ 494,390      
Number of small business customers | Loan 2,680      
Real Estate [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases $ 2,368,090 2,133,699    
Total net loans and leases 2,357,912 2,121,353    
Allowance for credit losses (42,452) (40,939)    
Commercial Real Estate [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 1,167,516 971,326    
Total net loans and leases 1,157,338 958,980    
Allowance for credit losses (28,536) (27,679)    
Agricultural [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 672,830 643,014    
Total net loans and leases 672,830 643,014    
Allowance for credit losses (9,613) (8,633)    
Residential and Home Equity [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 350,581 333,618    
Total net loans and leases 350,581 333,618    
Allowance for credit losses (2,847) (2,984) (3,530) (3,641)
Construction [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 177,163 185,741    
Total net loans and leases 177,163 185,741    
Allowance for credit losses (1,456) (1,643) (1,949) (1,249)
Commercial and Industrial [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 427,799 374,816    
Total net loans and leases 427,799 374,816    
Allowance for credit losses (11,489) (9,961)    
Agricultural [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 276,684 264,372    
Total net loans and leases 276,684 264,372    
Allowance for credit losses (5,465) (4,814)    
Commercial Leases [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases 96,971 103,117    
Total net loans and leases 96,415 103,522    
Allowance for credit losses (938) (1,731) (3,162) (4,022)
Consumer and Other [Member]        
Loan & Lease Portfolio [Abstract]        
Total gross loans and leases [1] 78,367 235,529    
Total net loans and leases 78,367 235,529    
Allowance for credit losses $ (263) $ (333) $ (456) $ (494)
[1] Includes SBA PPP loans.