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Loans and Leases - Activity in Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Individually $ 14,152 $ 16,072 $ 16,413
Collectively 1,748,412 1,715,856 1,541,407
Total Financing Receivables 1,762,565 1,731,928  
Real Estate Sector [Member]      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Individually 12,745 13,501 13,072
Collectively 1,389,368 1,440,429 1,213,644
Total Financing Receivables 1,402,114 1,453,930  
Agricultural Sector [Member]      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Individually 5 6  
Collectively 48,031 49,097 46,796
Total Financing Receivables 48,036 49,103  
Commercial and Industrial and Mortgage Warehouse Sector [Member]      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Individually [1] 977 1,744 2,064
Collectively [1] 303,658 218,289 271,618
Consumer Loans Sector [Member]      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Individually 425 821 1,277
Collectively 7,355 8,041 $ 9,349
Total Financing Receivables $ 7,780 $ 8,862  
[1] Includes mortgage warehouse lines