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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, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 10,536 $ 463
Loans acquired with deteriorated credit quality   6,290
Collectively evaluated for impairment 1,600,742 1,467,671
Total 1,611,278 1,474,424
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 575  
Loans acquired with deteriorated credit quality   567
Collectively evaluated for impairment 315,564 298,246
Total 316,139 298,813
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,222 402
Loans acquired with deteriorated credit quality   2,049
Collectively evaluated for impairment 686,263 649,093
Total 688,485 651,544
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality   2,034
Collectively evaluated for impairment 66,767 66,881
Total 66,767 68,915
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 41,305 32,469
Total 41,305 32,469
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 7,071 61
Loans acquired with deteriorated credit quality   1,640
Collectively evaluated for impairment 197,943 185,556
Total 205,014 187,257
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 32,740 35,277
Total 32,740 35,277
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 668  
Collectively evaluated for impairment 260,160 200,149
Total $ 260,828 $ 200,149