Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,603,877,000	$ 1,474,424,000
Deferred fees, net	(259,000)	(479,000)
Total loans receivable	1,603,618,000	1,473,945,000
Allowance for credit losses	(18,968,000)	(16,999,000)
Net loans receivable	$ 1,584,650,000	$ 1,456,946,000
Percent of Loans	100.00%	100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 316,546,000	$ 298,813,000
Allowance for credit losses	$ (1,351,000)	$ (1,288,000)
Percent of Loans	19.70%	20.30%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 675,156,000	$ 651,544,000
Allowance for credit losses	$ (11,871,000)	$ (13,820,000)
Percent of Loans	42.10%	44.20%
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 63,859,000	$ 68,915,000
Allowance for credit losses		$ (59,000)
Percent of Loans	4.00%	4.70%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 51,453,000	$ 32,469,000
Allowance for credit losses	$ (933,000)	$ (797,000)
Percent of Loans	3.20%	2.20%
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 200,576,000	$ 187,257,000
Allowance for credit losses	$ (1,207,000)	$ (1,289,000)
Percent of Loans	12.50%	12.70%
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 31,966,000	$ 35,277,000
Allowance for credit losses		$ (127,000)
Percent of Loans	2.00%	2.40%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 264,321,000	$ 200,149,000
Allowance for credit losses	$ (3,454,000)	$ (2,085,000)
Percent of Loans	16.50%	13.50%