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Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,714,082,000	$ 1,603,877,000
Deferred fees, net	(444,000)	(259,000)
Total loans receivable	1,713,638,000	1,603,618,000
Allowance for credit losses	(19,843,000)	(18,968,000)	$ (16,999,000)
Net loans receivable	$ 1,693,795,000	$ 1,584,650,000
Percent of Loans	100.00%	100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 330,856,000	$ 316,546,000
Allowance for credit losses	$ (1,146,000)	$ (1,351,000)	(2,833,000)
Percent of Loans	19.30%	19.70%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 716,875,000	$ 675,156,000
Allowance for credit losses	$ (11,406,000)	$ (11,871,000)	(8,293,000)
Percent of Loans	41.80%	42.10%
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 63,488,000	$ 63,859,000
Percent of Loans	3.70%	4.00%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 53,020,000	$ 51,453,000
Allowance for credit losses	$ (884,000)	$ (933,000)	(409,000)
Percent of Loans	3.10%	3.20%
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 211,991,000	$ 200,576,000
Allowance for credit losses	$ (1,732,000)	$ (1,207,000)	(2,445,000)
Percent of Loans	12.40%	12.50%
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 30,077,000	$ 31,966,000
Percent of Loans	1.70%	2.00%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 307,775,000	$ 264,321,000
Allowance for credit losses	$ (4,465,000)	$ (3,454,000)	$ (2,636,000)
Percent of Loans	18.00%	16.50%

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