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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Unpaid contractual principal | $ 11,053 | $ 11,710
Impaired loan balance | 9,103 | 9,760
Impaired loans without an allowance | 6,726 | 5,551
Impaired loans with an allowance | 2,377 | 4,209
Related allowance recorded | 870 | 642
Year-to-date average loan balance | 9,437 | 10,017
Year-to-date interest income recognized | 454 | 569
One-To-Four Family Residential Real Estate Loan [Member] |  |
Unpaid contractual principal | 773 | 747
Impaired loan balance | 773 | 747
Impaired loans without an allowance | 450 | 503
Impaired loans with an allowance | 323 | 244
Related allowance recorded | 190 | 73
Year-to-date average loan balance | 793 | 774
Year-to-date interest income recognized | 7 | 8
Construction and Land Loan [Member] |  |
Unpaid contractual principal | 3,351 | 3,766
Impaired loan balance | 1,616 | 2,031
Impaired loans without an allowance | 1,616 | 430
Impaired loans with an allowance |  | 1,601
Related allowance recorded |  | 102
Year-to-date average loan balance | 1,817 | 2,033
Year-to-date interest income recognized | 42 | 65
Commercial Real Estate Loan [Member] |  |
Unpaid contractual principal | 3,916 | 3,973
Impaired loan balance | 3,916 | 3,973
Impaired loans without an allowance | 3,880 | 3,888
Impaired loans with an allowance | 36 | 85
Related allowance recorded | 13 | 52
Year-to-date average loan balance | 3,926 | 3,989
Year-to-date interest income recognized | 365 | 490
Commercial Loan [Member] |  |
Unpaid contractual principal | 2,013 | 2,002
Impaired loan balance | 2,013 | 2,002
Impaired loans without an allowance | 2 | 11
Impaired loans with an allowance | 2,011 | 1,991
Related allowance recorded | 666 | 391
Year-to-date average loan balance | 2,043 | 2,082
Year-to-date interest income recognized |  |
Agriculture Loan [Member] |  |
Unpaid contractual principal | 862 |
Impaired loan balance | 647 |
Impaired loans without an allowance | 647 |
Impaired loans with an allowance |  |
Related allowance recorded |  |
Year-to-date average loan balance | 717 |
Year-to-date interest income recognized | 39 |
Municipal Loan [Member] |  |
Unpaid contractual principal | 58 | 140
Impaired loan balance | 58 | 140
Impaired loans without an allowance | 58 | 140
Impaired loans with an allowance |  |
Related allowance recorded |  |
Year-to-date average loan balance | 58 | 192
Year-to-date interest income recognized | 1 | 5
Consumer Loan [Member] |  |
Unpaid contractual principal | 80 | 34
Impaired loan balance | 80 | 34
Impaired loans without an allowance | 73 | 34
Impaired loans with an allowance | 7 |
Related allowance recorded | 1 |
Year-to-date average loan balance | 83 | 35
Year-to-date interest income recognized |  |
Agriculture Loan [Member] |  |
Unpaid contractual principal |  | 1,048
Impaired loan balance |  | 833
Impaired loans without an allowance |  | 545
Impaired loans with an allowance |  | 288
Related allowance recorded |  | 24
Year-to-date average loan balance |  | 912
Year-to-date interest income recognized |  | $ 1

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