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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 1,416,473 |  | $ 924,676 |  |  |
Deferred fees, net | (1,811) |  | (95) |  |  |
Total loans receivable | 1,414,662 |  | 924,581 |  |  |
Allowance for loan losses | (11,674) | $ (10,312) | (8,509) | $ (8,405) | $ (8,228) | $ (8,452)
Net loans receivable | $ 1,402,988 |  | $ 916,072 |  |  |
Percent of Loans | 100.00% |  | 100.00% |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 263,404 |  | $ 229,781 |  |  |
Allowance for loan losses | $ (1,678) | (1,652) | $ (1,552) | (1,568) | (1,447) | (1,328)
Percent of Loans | 18.60% |  | 24.90% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 574,123 |  | $ 391,327 |  |  |
Allowance for loan losses | $ (7,168) | (6,079) | $ (4,687) | (4,566) | (4,694) | (5,455)
Percent of Loans | 40.50% |  | 42.30% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 68,340 |  |  |  |  |
Percent of Loans | 4.80% |  |  |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 20,797 |  | $ 17,732 |  |  |
Allowance for loan losses | $ (125) | (86) | $ (95) | (107) | (112) | (93)
Percent of Loans | 1.50% |  | 1.90% |  |  |
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 285,295 |  | $ 134,150 |  |  |
Allowance for loan losses | $ (1,209) | (1,076) | $ (949) | (943) | (896) | (712)
Percent of Loans | 20.10% |  | 14.50% |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 42,297 |  |  |  |  |
Percent of Loans | 3.00% |  |  |  |  |
Consumer Loans To Individuals [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 162,217 |  | $ 151,686 |  |  |
Allowance for loan losses | $ (1,494) | $ (1,419) | $ (1,226) | $ (1,221) | $ (1,079) | $ (864)
Percent of Loans | 11.50% |  | 16.40% |  |  |

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