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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
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality $ 8,481 $ 9,281
Total Loans 1,372,774 1,412,289
Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,605 2,662
Loans acquired with deteriorated credit quality 8,481 9,281
Collectively evaluated for impairment 1,361,688 1,400,346
Total Loans 1,372,774 1,412,289
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 265,778 263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 787 591
Collectively evaluated for impairment 264,991 262,536
Total Loans 265,778 263,127
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 612,794 579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,603 2,582
Loans acquired with deteriorated credit quality 3,405 3,995
Collectively evaluated for impairment 606,927 572,527
Total Loans 611,935 579,104
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 64,018 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 1,959 2,043
Collectively evaluated for impairment 62,059 64,291
Total Loans 64,876 66,334
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 23,892 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   194
Collectively evaluated for impairment 23,892 20,811
Total Loans 23,892 21,005
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 216,692 283,741
Commercial [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 18 80
Loans acquired with deteriorated credit quality 128 246
Collectively evaluated for impairment 216,421 283,415
Total Loans 216,567 283,741
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 40,257 40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 126  
Loans acquired with deteriorated credit quality 2,202 2,212
Collectively evaluated for impairment 38,055 38,717
Total Loans 40,383 40,929
Consumer Loans To Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 149,343 158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 149,343 158,049
Total Loans $ 149,343 $ 158,049