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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Unpaid contractual principal | $ 10,968 | $ 11,710
Impaired loan balance | 9,018 | 9,760
Impaired loans without an allowance | 4,676 | 5,551
Impaired loans with an allowance | 4,342 | 4,209
Related allowance recorded | 853 | 642
Year-to-date average loan balance | 9,208 | 10,017
Year-to-date interest income recognized | 313 | 569
One-To-Four Family Residential Real Estate Loan [Member] |  |
Unpaid contractual principal | 651 | 747
Impaired loan balance | 651 | 747
Impaired loans without an allowance | 395 | 503
Impaired loans with an allowance | 256 | 244
Related allowance recorded | 85 | 73
Year-to-date average loan balance | 661 | 774
Year-to-date interest income recognized | 5 | 8
Construction and Land Loan [Member] |  |
Unpaid contractual principal | 3,376 | 3,766
Impaired loan balance | 1,641 | 2,031
Impaired loans without an allowance | 1,641 | 430
Impaired loans with an allowance |  | 1,601
Related allowance recorded |  | 102
Year-to-date average loan balance | 1,736 | 2,033
Year-to-date interest income recognized | 29 | 65
Commercial Real Estate Loan [Member] |  |
Unpaid contractual principal | 3,920 | 3,973
Impaired loan balance | 3,920 | 3,973
Impaired loans without an allowance | 2,127 | 3,888
Impaired loans with an allowance | 1,793 | 85
Related allowance recorded | 14 | 52
Year-to-date average loan balance | 3,926 | 3,989
Year-to-date interest income recognized | 243 | 490
Commercial Loan [Member] |  |
Unpaid contractual principal | 2,032 | 2,002
Impaired loan balance | 2,032 | 2,002
Impaired loans without an allowance | 3 | 11
Impaired loans with an allowance | 2,029 | 1,991
Related allowance recorded | 728 | 391
Year-to-date average loan balance | 2,055 | 2,082
Year-to-date interest income recognized | 8 |
Agriculture Loan [Member] |  |
Unpaid contractual principal | 817 | 1,048
Impaired loan balance | 602 | 833
Impaired loans without an allowance | 344 | 545
Impaired loans with an allowance | 258 | 288
Related allowance recorded | 25 | 24
Year-to-date average loan balance | 652 | 912
Year-to-date interest income recognized | 27 | 1
Municipal Loan [Member] |  |
Unpaid contractual principal | 126 | 140
Impaired loan balance | 126 | 140
Impaired loans without an allowance | 126 | 140
Impaired loans with an allowance |  |
Related allowance recorded |  |
Year-to-date average loan balance | 132 | 192
Year-to-date interest income recognized | 1 | 5
Consumer Loan [Member] |  |
Unpaid contractual principal | 46 | 34
Impaired loan balance | 46 | 34
Impaired loans without an allowance | 40 | 34
Impaired loans with an allowance | 6 |
Related allowance recorded | 1 |
Year-to-date average loan balance | 46 | 35
Year-to-date interest income recognized |  |

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