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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, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 1,674 $ 2,662
Loans acquired with deteriorated credit quality 8,304 9,281
Collectively evaluated for impairment 1,346,062 1,400,346
Total Loans 1,356,040 1,412,289
Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 8,304 9,281
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 784 591
Collectively evaluated for impairment 272,256 262,536
Total Loans 273,040 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 784 591
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,658 2,582
Loans acquired with deteriorated credit quality 3,285 3,995
Collectively evaluated for impairment 623,781 572,527
Total Loans 628,724 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 3,285 3,995
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 1,918 2,043
Collectively evaluated for impairment 60,007 64,291
Total Loans 61,925 66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 1,918 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 21,990 20,811
Total Loans 21,990 21,005
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 16 80
Loans acquired with deteriorated credit quality 198 246
Collectively evaluated for impairment 185,817 283,415
Total Loans 186,031 283,741
Commercial [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 198 246
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 2,119 2,212
Collectively evaluated for impairment 35,811 38,717
Total Loans 37,930 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 2,119 2,212
Consumer Loans To Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 146,400 158,049
Total Loans $ 146,400 $ 158,049