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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 1,405,017 |  | $ 1,356,040 |  |  |
Deferred fees, net | (700) |  | (1,109) |  |  |
Total loans receivable | 1,404,317 |  | 1,354,931 |  |  |
Allowance for loan losses | (17,017) | $ (16,660) | (16,442) | $ (15,340) | $ (14,509) | $ (13,150)
Net loans receivable | $ 1,387,300 |  | $ 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 | $ 289,157 |  | $ 273,040 |  |  |
Allowance for loan losses | $ (2,740) | (2,326) | $ (2,175) | (2,233) | (2,124) | (1,960)
Percent of Loans | 20.60% |  | 20.10% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 645,404 |  | $ 628,724 |  |  |
Allowance for loan losses | $ (9,155) | (10,287) | $ (10,878) | (9,580) | (9,084) | (8,004)
Percent of Loans | 45.90% |  | 46.40% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 65,334 |  | $ 61,925 |  |  |
Percent of Loans | 4.60% |  | 4.60% |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 21,856 |  | $ 21,990 |  |  |
Allowance for loan losses | $ (242) | (134) | $ (133) | (137) | (122) | (150)
Percent of Loans | 1.60% |  | 1.60% |  |  |
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 187,206 |  | $ 186,031 |  |  |
Allowance for loan losses | $ (2,504) | (1,495) | $ (1,490) | (1,503) | (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 | $ 36,092 |  | $ 37,930 |  |  |
Percent of Loans | 2.60% |  | 2.80% |  |  |
Consumer Loans To Individuals [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 159,968 |  | $ 146,400 |  |  |
Allowance for loan losses | $ (2,046) | $ (1,622) | $ (1,766) | $ (1,887) | $ (1,774) | $ (1,676)
Percent of Loans | 11.40% |  | 10.80% |  |  |

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