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Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of Loans [Abstract]    
Net Loans $ 6,887,709 $ 6,583,639
Deferred loan origination costs, net 43,500 42,600
Residential loans held for sale 6,900 700
Loans serviced for unrelated third parties 557,900 586,700
Mortgage servicing rights 500 600
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance at January 1 1,577 2,050
New loans 260 297
Adjustment due to change in composition of related parties 0 198
Repayments (199) (968)
Balance at December 31 1,638 1,577
Commercial Loans [Member]    
Summary of Loans [Abstract]    
Net Loans 3,222,310 3,027,832
Commercial Loans [Member] | Commercial [Member]    
Summary of Loans [Abstract]    
Net Loans 1,291,568 1,258,212
Commercial Loans [Member] | Commercial Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 1,930,742 1,769,620
Commercial Loans [Member] | Agricultural and Agricultural Real Estate Mortgages [Member]    
Summary of Loans [Abstract]    
Loans serviced for unrelated third parties 27,200 29,100
Residential Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 1,380,836 1,320,370
Consumer Loans [Member]    
Summary of Loans [Abstract]    
Net Loans 2,284,563 2,235,437
Consumer Loans [Member] | Dealer Finance [Member]    
Summary of Loans [Abstract]    
Net Loans 1,216,144 1,227,870
Consumer Loans [Member] | Specialty Lending [Member]    
Summary of Loans [Abstract]    
Net Loans 524,928 438,866
Consumer Loans [Member] | Home Equity [Member]    
Summary of Loans [Abstract]    
Net Loans 474,566 498,179
Consumer Loans [Member] | Other Consumer [Member]    
Summary of Loans [Abstract]    
Net Loans $ 68,925 $ 70,522