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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
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality $ 8,398 $ 9,281
Total Loans 1,389,620 1,412,289
Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,209 2,662
Loans acquired with deteriorated credit quality 8,398 9,281
Collectively evaluated for impairment 1,379,013 1,400,346
Total Loans 1,389,620 1,412,289
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 258,130 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 572 591
Collectively evaluated for impairment 257,558 262,536
Total Loans 258,130 263,127
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 597,906 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,206 2,582
Loans acquired with deteriorated credit quality 3,460 3,995
Collectively evaluated for impairment 593,240 572,527
Total Loans 597,906 579,104
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 64,245 66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 858  
Loans acquired with deteriorated credit quality 1,906 2,043
Collectively evaluated for impairment 61,481 64,291
Total Loans 64,245 66,334
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 21,839 21,005
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 202 194
Collectively evaluated for impairment 21,637 20,811
Total Loans 21,839 21,005
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 250,872 283,741
Commercial [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 20 80
Loans acquired with deteriorated credit quality 131 246
Collectively evaluated for impairment 250,721 283,415
Total Loans 250,872 283,741
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 41,836 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 125  
Loans acquired with deteriorated credit quality 2,127 2,212
Collectively evaluated for impairment 39,584 38,717
Total Loans 41,836 40,929
Consumer Loans To Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 154,792 158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 154,792 158,049
Total Loans $ 154,792 $ 158,049