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Loans Receivable and Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 1,085 |  | $ 1,085 |  | $ 2,662
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,520 |  | 1,520 |  |
Impaired Financing Receivable, Recorded Investment | 2,605 |  | 2,605 |  | 2,662
Unpaid Principal Balance, With no related allowance recorded | 1,085 |  | 1,085 |  | 3,314
Unpaid Principal Balance, With an allowance recorded | 1,520 |  | 1,520 |  |
Unpaid Principal Balance, Total | 2,605 |  | 2,605 |  | 3,314
Associated Allowance | 275 |  | 275 |  |
Average Recorded Investment, Total | 2,407 | $ 1,874 |  |  |
Interest Income Recognized, Total | 55 | 2 |  |  |
Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 1,520 |  | 1,520 |  |
Associated Allowance | 275 |  | 275 |  |
Average Recorded Investment, Total |  |  | 2,551 | $ 1,986 |
Interest Income Recognized, Total |  |  | 56 | 6 |
Commercial Real Estate Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 83 |  | 83 |  | 80
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,520 |  | 1,520 |  |
Impaired Financing Receivable, Recorded Investment | 1,603 |  | 1,603 |  | 80
Unpaid Principal Balance, With no related allowance recorded | 83 |  | 83 |  | 80
Unpaid Principal Balance, With an allowance recorded | 1,520 |  | 1,520 |  |
Unpaid Principal Balance, Total | 1,603 |  | 1,603 |  | 80
Associated Allowance | 275 |  | 275 |  |
Average Recorded Investment, Total | 1,405 | 1,874 |  |  |
Interest Income Recognized, Total | 55 | $ 2 |  |  |
Commercial Real Estate Loans [Member] | Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment, Total |  |  | 1,560 | 1,986 |
Interest Income Recognized, Total |  |  | 56 | $ 6 |
Agricultural Real Estate Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 858 |  | 858 |  |
Impaired Financing Receivable, Recorded Investment | 858 |  | 858 |  |
Unpaid Principal Balance, With no related allowance recorded | 858 |  | 858 |  |
Unpaid Principal Balance, Total | 858 |  | 858 |  |
Average Recorded Investment, Total | 858 |  |  |  |
Agricultural Real Estate Loans [Member] | Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment, Total |  |  | 858 |  |
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 18 |  | 18 |  | 2,582
Impaired Financing Receivable, Recorded Investment | 18 |  | 18 |  | 2,582
Unpaid Principal Balance, With no related allowance recorded | 18 |  | 18 |  | 3,234
Unpaid Principal Balance, Total | 18 |  | 18 |  | $ 3,234
Average Recorded Investment, Total | 19 |  |  |  |
Commercial [Member] | Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment, Total |  |  | 19 |  |
Other Agricultural Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 126 |  | 126 |  |
Impaired Financing Receivable, Recorded Investment | 126 |  | 126 |  |
Unpaid Principal Balance, With no related allowance recorded | 126 |  | 126 |  |
Unpaid Principal Balance, Total | 126 |  | 126 |  |
Average Recorded Investment, Total | $ 125 |  |  |  |
Other Agricultural Loans [Member] | Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment, Total |  |  | $ 114 |  |

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