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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 ($)
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated $ 10,022,000 $ 7,622,000
Collectively evaluated 1,704,060,000 1,596,255,000
Total 1,714,082,000 1,603,877,000
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 940,000 432,000
Collectively evaluated 329,916,000 316,114,000
Total 330,856,000 316,546,000
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 7,197,000 2,211,000
Collectively evaluated 709,678,000 672,945,000
Total 716,875,000 675,156,000
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated 63,488,000 63,859,000
Total 63,488,000 63,859,000
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated 53,020,000 51,453,000
Total 53,020,000 51,453,000
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 854,000 4,264,000
Collectively evaluated 211,137,000 196,312,000
Total 211,991,000 200,576,000
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated 30,077,000 31,966,000
Total 30,077,000 31,966,000
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated 1,031,000 715,000
Collectively evaluated 306,744,000 263,606,000
Total $ 307,775,000 $ 264,321,000