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Loans Receivable and Allowance for Loan Losses (Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	$ 988,836	$ 970,108
Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount		441,425
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	967,955	943,427
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	9,025	14,680
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	11,856	12,001
Summarized by Performance of Individual Credits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	435,492	442,181
Summarized by Performance of Individual Credits [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	434,954
Summarized by Performance of Individual Credits [Member] | Nonperforming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	538	756
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	581,329	579,104
Commercial Real Estate Loans [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	568,817	566,418
Commercial Real Estate Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	6,207	6,346
Commercial Real Estate Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	6,305	6,340
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	64,954	66,334
Agricultural Real Estate Loans [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	60,967	58,322
Agricultural Real Estate Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	1,123	5,111
Agricultural Real Estate Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	2,864	2,901
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	302,431	283,741
Commercial [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	301,648	282,915
Commercial [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	395	437
Commercial [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	388	389
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	40,122	40,929
Other Agricultural Loans [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	36,523	35,772
Other Agricultural Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	1,300	2,786
Other Agricultural Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	2,299	2,371
Residential Real Estate Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount		262,556
Residential Real Estate Loans [Member] | Summarized by Performance of Individual Credits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	261,450	263,127
Residential Real Estate Loans [Member] | Summarized by Performance of Individual Credits [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	261,033
Residential Real Estate Loans [Member] | Summarized by Performance of Individual Credits [Member] | Nonperforming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	417	571
Construction Real Estate Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount		21,005
Construction Real Estate Loans [Member] | Summarized by Performance of Individual Credits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	20,237	21,005
Construction Real Estate Loans [Member] | Summarized by Performance of Individual Credits [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	20,237
Consumer Loans To Individuals [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount		157,864
Consumer Loans To Individuals [Member] | Summarized by Performance of Individual Credits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	153,805	158,049
Consumer Loans To Individuals [Member] | Summarized by Performance of Individual Credits [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	153,684
Consumer Loans To Individuals [Member] | Summarized by Performance of Individual Credits [Member] | Nonperforming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Amount	$ 121	$ 185

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No definition available.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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