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Loans - Classes of Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of classes of loans [Abstract]      
Loans and receivable $ 2,639,104 $ 2,627,943 $ 2,459,671
Net unamortized fees and costs 933 952  
Loans and receivable, gross 2,640,037 2,628,895  
Less allowance for loan losses 33,760 37,810  
Loans and receivable, net 2,606,277 2,591,085  
Agricultural [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 91,317 92,673 88,580
Commercial and financial [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 221,323 229,501 218,632
Construction, 1 to 4 family residential [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 80,209 72,279  
Construction, land development and commercial [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 108,410 113,807  
Mortgage, farmland [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 242,730 236,454 $ 215,286
Mortgage, 1 to 4 family first liens [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 910,742 912,059  
Mortgage, 1 to 4 family junior liens [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 149,227 152,625  
Mortgage, multi-family [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 350,761 352,434  
Mortgage, commercial [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 402,181 383,314  
Loans to individuals [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable 32,308 30,072  
Obligations of state and political subdivisions [Member]      
Summary of classes of loans [Abstract]      
Loans and receivable $ 49,896 $ 52,725