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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 1,372,774		$ 1,412,289
Deferred fees, net	(1,772)		(1,557)
Total loans receivable	1,371,002		1,410,732
Allowance for loan losses	(16,103)	$ (15,340)	(13,150)	$ (11,674)	$ (10,312)	$ (8,509)
Net loans receivable	$ 1,354,899		$ 1,397,582
Percent of Loans	100.00%		100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 265,778		$ 263,127
Allowance for loan losses	$ (2,443)	(2,233)	$ (1,960)	(1,678)	(1,652)	(1,552)
Percent of Loans	19.40%		18.60%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 612,794		$ 579,104
Allowance for loan losses	$ (9,891)	(9,580)	$ (8,004)	(7,168)	(6,079)	(4,687)
Percent of Loans	44.60%		41.00%
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 64,018		$ 66,334
Percent of Loans	4.70%		4.70%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 23,892		$ 21,005
Allowance for loan losses	$ (163)	(137)	$ (150)	(125)	(86)	(95)
Percent of Loans	1.70%		1.50%
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 216,692		$ 283,741
Allowance for loan losses	$ (1,605)	(1,503)	$ (1,360)	(1,209)	(1,076)	(949)
Percent of Loans	15.80%		20.10%
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 40,257		$ 40,929
Percent of Loans	2.90%		2.90%
Consumer Loans To Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 149,343		$ 158,049
Allowance for loan losses	$ (2,001)	$ (1,887)	$ (1,676)	$ (1,494)	$ (1,419)	$ (1,226)
Percent of Loans	10.90%		11.20%

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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