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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 ($)
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated $ 10,100,000 $ 10,022,000
Collectively evaluated 1,761,582,000 1,704,060,000
Total 1,771,682,000 1,714,082,000
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 838,000 940,000
Collectively evaluated 329,450,000 329,916,000
Total 330,288,000 330,856,000
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 7,194,000 7,197,000
Collectively evaluated 723,962,000 709,678,000
Total 731,156,000 716,875,000
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated 63,213,000 63,488,000
Total 63,213,000 63,488,000
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 11,000  
Collectively evaluated 58,215,000 53,020,000
Total 58,226,000 53,020,000
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 847,000 854,000
Collectively evaluated 232,632,000 211,137,000
Total 233,479,000 211,991,000
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 10,000  
Collectively evaluated 27,627,000 30,077,000
Total 27,637,000 30,077,000
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 1,200,000 1,031,000
Collectively evaluated 326,483,000 306,744,000
Total $ 327,683,000 $ 307,775,000