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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 ($)
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 7,641,000 $ 7,622,000
Collectively evaluated for impairment 1,633,890,000 1,596,255,000
Total 1,641,531,000 1,603,877,000
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 953,000 432,000
Collectively evaluated for impairment 316,554,000 316,114,000
Total 317,507,000 316,546,000
Commercial Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 5,780,000 2,211,000
Collectively evaluated for impairment 679,432,000 672,945,000
Total 685,212,000 675,156,000
Agricultural Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 60,963,000 63,859,000
Total 60,963,000 63,859,000
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 48,030,000 51,453,000
Total 48,030,000 51,453,000
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 108,000 4,264,000
Collectively evaluated for impairment 208,550,000 196,312,000
Total 208,658,000 200,576,000
Other Agricultural Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment 31,281,000 31,966,000
Total 31,281,000 31,966,000
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 800,000 715,000
Collectively evaluated for impairment 289,080,000 263,606,000
Total $ 289,880,000 $ 264,321,000