Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 1,372,492	$ 1,356,040
Deferred fees, net	(847)	(1,109)
Total loans receivable	1,371,645	1,354,931
Allowance for loan losses	(16,660)	(16,442)	$ (14,509)	$ (13,150)
Net loans receivable	$ 1,354,985	$ 1,338,489
Percent of Loans	100.00%	100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 276,592	$ 273,040
Allowance for loan losses	$ (2,326)	$ (2,175)	(2,124)	(1,960)
Percent of Loans	20.20%	20.10%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 641,581	$ 628,724
Allowance for loan losses	$ (10,287)	$ (10,878)	(9,084)	(8,004)
Percent of Loans	46.70%	46.40%
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 64,153	$ 61,925
Percent of Loans	4.70%	4.60%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 19,407	$ 21,990
Allowance for loan losses	$ (134)	$ (133)	(122)	(150)
Percent of Loans	1.40%	1.60%
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 183,212	$ 186,031
Allowance for loan losses	$ (1,495)	$ (1,490)	(1,405)	(1,360)
Percent of Loans	13.30%	13.70%
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 36,729	$ 37,930
Percent of Loans	2.70%	2.80%
Consumer Loans To Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 150,818	$ 146,400
Allowance for loan losses	$ (1,622)	$ (1,766)	$ (1,774)	$ (1,676)
Percent of Loans	11.00%	10.80%