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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
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality $ 9,165 $ 9,281
Total Loans 1,424,328 1,412,289
Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,749 2,662
Loans acquired with deteriorated credit quality 9,165 9,281
Collectively evaluated for impairment 1,412,414 1,400,346
Total Loans 1,424,328 1,412,289
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 261,450 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 582 591
Collectively evaluated for impairment 260,868 262,536
Total Loans 261,450 263,127
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 581,329 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,586 2,582
Loans acquired with deteriorated credit quality 3,966 3,995
Collectively evaluated for impairment 574,777 572,527
Total Loans 581,329 579,104
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 64,954 66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 2,006 2,043
Collectively evaluated for impairment 62,948 64,291
Total Loans 64,954 66,334
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 20,237 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 198 194
Collectively evaluated for impairment 20,039 20,811
Total Loans 20,237 21,005
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 302,431 283,741
Commercial [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 163 80
Loans acquired with deteriorated credit quality 240 246
Collectively evaluated for impairment 302,028 283,415
Total Loans 302,431 283,741
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 40,122 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 2,173 2,212
Collectively evaluated for impairment 37,949 38,717
Total Loans 40,122 40,929
Consumer Loans To Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 153,805 158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 153,805 158,049
Total Loans $ 153,805 $ 158,049