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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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