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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,536,037		$ 1,474,424
Deferred fees, net	(394)		(479)
Total loans receivable	1,535,643		1,473,945
Allowance for credit losses	(19,445)		(16,999)	$ (16,660)	$ (16,442)
Net loans receivable	$ 1,516,198		$ 1,456,946
Percent of Loans	100.00%		100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 301,711		$ 298,813
Allowance for credit losses	$ (1,359)	$ (1,288)	$ (2,833)	(2,326)	(2,175)
Percent of Loans	19.70%		20.30%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 668,386		$ 651,544
Allowance for credit losses	$ (13,725)	(13,820)	$ (8,293)	(10,287)	(10,878)
Percent of Loans	43.50%		44.20%
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 68,381		$ 68,915
Allowance for credit losses		(59)
Percent of Loans	4.50%		4.70%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 32,391		$ 32,469
Allowance for credit losses	$ (703)	(797)	$ (409)	(134)	(133)
Percent of Loans	2.10%		2.20%
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 207,888		$ 187,257
Allowance for credit losses	$ (1,158)	(1,289)	$ (2,445)	(1,495)	(1,490)
Percent of Loans	13.50%		12.70%
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 34,033		$ 35,277
Allowance for credit losses		(127)
Percent of Loans	2.20%		2.40%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 223,247		$ 200,149
Allowance for credit losses	$ (2,297)	$ (2,085)	$ (2,636)	$ (1,622)	$ (1,766)
Percent of Loans	14.50%		13.50%

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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