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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 1,389,620 |  | $ 1,412,289 |  |  |
Deferred fees, net | (2,966) |  | (1,557) |  |  |
Total loans receivable | 1,386,654 |  | 1,410,732 |  |  |
Allowance for loan losses | (15,340) | $ (14,509) | (13,150) | $ (10,312) | $ (9,088) | $ (8,509)
Net loans receivable | $ 1,371,314 |  | $ 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 | $ 258,130 |  | $ 263,127 |  |  |
Allowance for loan losses | $ (2,233) | (2,124) | $ (1,960) | (1,652) | (1,644) | (1,552)
Percent of Loans | 18.60% |  | 18.60% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 597,906 |  | $ 579,104 |  |  |
Allowance for loan losses | $ (9,580) | (9,084) | $ (8,004) | (6,079) | (4,915) | (4,687)
Percent of Loans | 43.00% |  | 41.00% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 64,245 |  | $ 66,334 |  |  |
Percent of Loans | 4.60% |  | 4.70% |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 21,839 |  | $ 21,005 |  |  |
Allowance for loan losses | $ (137) | (122) | $ (150) | (86) | (87) | (95)
Percent of Loans | 1.60% |  | 1.50% |  |  |
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 250,872 |  | $ 283,741 |  |  |
Allowance for loan losses | $ (1,503) | (1,405) | $ (1,360) | (1,076) | (1,064) | (949)
Percent of Loans | 18.10% |  | 20.10% |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 41,836 |  | $ 40,929 |  |  |
Percent of Loans | 3.00% |  | 2.90% |  |  |
Consumer Loans To Individuals [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 154,792 |  | $ 158,049 |  |  |
Allowance for loan losses | $ (1,887) | $ (1,774) | $ (1,676) | $ (1,419) | $ (1,378) | $ (1,226)
Percent of Loans | 11.10% |  | 11.20% |  |  |

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