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Loans Receivable and Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Loans $ 1,815,138,000 $ 1,714,082,000
Non-Accrual 6,565,000 7,720,000
Total Past Due and Non-Accrual 9,702,000 10,962,000
Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 1,805,436,000 1,703,120,000
Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 2,489,000 2,311,000
Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 623,000 777,000
Financing Receivables, Greater than 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 25,000 154,000
Residential Real Estate Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 339,997,000 330,856,000
Non-Accrual 1,077,000 940,000
Total Past Due and Non-Accrual 1,694,000 1,278,000
Residential Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 338,303,000 329,578,000
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 368,000 70,000
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 249,000 268,000
Commercial Real Estate Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 737,533,000 716,875,000
Non-Accrual 4,018,000 5,743,000
Total Past Due and Non-Accrual 4,501,000 7,054,000
Commercial Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 733,032,000 709,821,000
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 483,000 1,182,000
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans   129,000
Agricultural Real Estate Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 60,680,000 63,488,000
Total Past Due and Non-Accrual 639,000  
Agricultural Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 60,041,000 63,488,000
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 592,000  
Agricultural Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 47,000  
Construction Real Estate Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 80,311,000 53,020,000
Non-Accrual 50,000  
Total Past Due and Non-Accrual 50,000 11,000
Construction Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 80,261,000 53,009,000
Construction Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans   11,000
Commercial Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 223,460,000 211,991,000
Non-Accrual 69,000 127,000
Total Past Due and Non-Accrual 426,000 471,000
Commercial Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 223,034,000 211,520,000
Commercial Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 333,000 194,000
Commercial Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 24,000 117,000
Commercial Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans   33,000
Other Agricultural Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 26,260,000 30,077,000
Total Past Due and Non-Accrual 233,000 49,000
Other Agricultural Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 26,027,000 30,028,000
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 208,000 49,000
Other Agricultural Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 25,000  
Consumer Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 346,897,000 307,775,000
Non-Accrual 1,351,000 910,000
Total Past Due and Non-Accrual 2,159,000 2,099,000
Consumer Loans [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 344,738,000 305,676,000
Consumer Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans 505,000 805,000
Consumer Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans $ 303,000 263,000
Consumer Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans   $ 121,000