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Loans Receivable and Allowance for Credit Losses (Summary of Amount of Loans in Each Category that were Individually and Collectively Evaluated for Impairment) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated $ 8,718,000 $ 10,022,000
Collectively evaluated 1,806,420,000 1,704,060,000
Total 1,815,138,000 1,714,082,000
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 1,077,000 940,000
Collectively evaluated 338,920,000 329,916,000
Total 339,997,000 330,856,000
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 5,472,000 7,197,000
Collectively evaluated 732,061,000 709,678,000
Total 737,533,000 716,875,000
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated 60,680,000 63,488,000
Total 60,680,000 63,488,000
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 50,000  
Collectively evaluated 80,261,000 53,020,000
Total 80,311,000 53,020,000
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 743,000 854,000
Collectively evaluated 222,717,000 211,137,000
Total 223,460,000 211,991,000
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 25,000  
Collectively evaluated 26,235,000 30,077,000
Total 26,260,000 30,077,000
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 1,351,000 1,031,000
Collectively evaluated 345,546,000 306,744,000
Total $ 346,897,000 $ 307,775,000