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Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary of Loans [Abstract]    
Net Loans $ 7,498,885 $ 7,136,098
Deferred loan origination costs, net 9,400 35,300
Residential loans held for sale 1,100 11,500
Loans serviced for unrelated third parties 614,500 612,300
Mortgage servicing rights 1,300 800
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance at January 1 2,166 1,638
New loans 1,524 587
Adjustment due to change in composition of related parties 2,448 389
Repayments (202) (448)
Balance at December 31 5,936 2,166
Commercial [Member]    
Summary of Loans [Abstract]    
Net Loans 1,267,679 1,302,209
Commercial Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 2,380,358 2,142,057
Paycheck Protection Program [Member]    
Summary of Loans [Abstract]    
Net Loans 430,810 0
Residential Real Estate [Member]    
Summary of Loans [Abstract]    
Net Loans 1,466,662 1,445,156
Indirect Auto [Member]    
Summary of Loans [Abstract]    
Net Loans 931,286 1,193,635
Specialty Lending [Member]    
Summary of Loans [Abstract]    
Net Loans 579,644 542,063
Home Equity [Member]    
Summary of Loans [Abstract]    
Net Loans 387,974 444,082
Other Consumer [Member]    
Summary of Loans [Abstract]    
Net Loans 54,472 66,896
Agricultural and Agricultural Real Estate Mortgages [Member]    
Summary of Loans [Abstract]    
Loans serviced for unrelated third parties $ 25,700 $ 25,600