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Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 1,815,138,000   $ 1,714,082,000      
Deferred fees, net (456,000)   (444,000)      
Total loans receivable 1,814,682,000   1,713,638,000      
Allowance for credit losses (19,911,000) $ (20,908,000) (19,843,000) $ (18,699,000) $ (17,806,000) $ (18,968,000)
Net loans receivable $ 1,794,771,000   $ 1,693,795,000      
Percent of Loans 100.00%   100.00%      
Residential Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 339,997,000   $ 330,856,000      
Allowance for credit losses $ (1,117,000) (1,011,000) $ (1,146,000) (1,049,000) (1,131,000) (1,351,000)
Percent of Loans 18.70%   19.30%      
Commercial Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 737,533,000   $ 716,875,000      
Allowance for credit losses $ (9,400,000) (11,039,000) $ (11,406,000) (10,466,000) (9,552,000) (11,871,000)
Percent of Loans 40.60%   41.80%      
Agricultural Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 60,680,000   $ 63,488,000      
Allowance for credit losses $ (23,000) (39,000) $ (48,000) (26,000) (41,000) (58,000)
Percent of Loans 3.30%   3.70%      
Construction Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 80,311,000   $ 53,020,000      
Allowance for credit losses $ (1,316,000) (1,163,000) $ (884,000) (856,000) (840,000) (933,000)
Percent of Loans 4.50%   3.10%      
Commercial Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 223,460,000   $ 211,991,000      
Allowance for credit losses $ (2,087,000) (1,933,000) $ (1,732,000) (1,894,000) (2,035,000) (1,207,000)
Percent of Loans 12.30%   12.40%      
Other Agricultural Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 26,260,000   $ 30,077,000      
Percent of Loans 1.50%   1.70%      
Consumer Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loans $ 346,897,000   $ 307,775,000      
Allowance for credit losses $ (5,790,000) $ (5,559,000) $ (4,465,000) $ (4,276,000) $ (4,077,000) $ (3,454,000)
Percent of Loans 19.10%   18.00%