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Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Loans [Abstract]    
Net Loans $ 7,136,098 $ 6,887,709
Deferred loan origination costs, net 35,300 43,500
Residential loans held for sale 11,500 6,900
Loans serviced for unrelated third parties 612,300 557,900
Mortgage servicing rights 800 500
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance at January 1 1,638 1,577
New loans 587 260
Adjustment due to change in composition of related parties 389 0
Repayments (448) (199)
Balance at December 31 2,166 1,638
Commercial Loans [Member]    
Summary of Loans [Abstract]    
Net Loans 3,444,266 3,222,310
Commercial Loans [Member] | Commercial [Member]    
Summary of Loans [Abstract]    
Net Loans 1,302,209 1,291,568
Commercial Loans [Member] | Commercial Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 2,142,057 1,930,742
Commercial Loans [Member] | Agricultural and Agricultural Real Estate Mortgages [Member]    
Summary of Loans [Abstract]    
Loans serviced for unrelated third parties 25,600 27,200
Residential Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 1,445,156 1,380,836
Consumer Loans [Member]    
Summary of Loans [Abstract]    
Net Loans 2,246,676 2,284,563
Consumer Loans [Member] | Indirect Auto [Member]    
Summary of Loans [Abstract]    
Net Loans 1,193,635 1,216,144
Consumer Loans [Member] | Specialty Lending [Member]    
Summary of Loans [Abstract]    
Net Loans 542,063 524,928
Consumer Loans [Member] | Home Equity [Member]    
Summary of Loans [Abstract]    
Net Loans 444,082 474,566
Consumer Loans [Member] | Other Consumer [Member]    
Summary of Loans [Abstract]    
Net Loans $ 66,896 $ 68,925