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Loans Receivable and Allowance for Loan Losses (Summary of Amount of Loans in Each Category that were Individually and Collectively Evaluated for Impairment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 2,662 $ 2,144
Loans acquired with deteriorated credit quality 9,281 696
Collectively evaluated for impairment 1,400,346 921,836
Total Loans 1,412,289 924,676
Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 9,281 696
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 591 476
Collectively evaluated for impairment 262,536 229,305
Total Loans 263,127 229,781
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 591 476
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,582 2,144
Loans acquired with deteriorated credit quality 3,995 220
Collectively evaluated for impairment 572,527 388,963
Total Loans 579,104 391,327
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 3,995 220
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 2,043  
Collectively evaluated for impairment 64,291  
Total Loans 66,334  
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 2,043  
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 194  
Collectively evaluated for impairment 20,811 17,732
Total Loans 21,005 17,732
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 194  
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 80  
Loans acquired with deteriorated credit quality 246  
Collectively evaluated for impairment 283,415 134,150
Total Loans 283,741 134,150
Commercial [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 246  
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 2,212  
Collectively evaluated for impairment 38,717  
Total Loans 40,929  
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 2,212  
Consumer Loans To Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 158,049 151,686
Total Loans $ 158,049 $ 151,686