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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unpaid contractual principal | $ 10,641 | $ 11,710 | $ 8,755
Impaired loan balance | 8,691 | 9,760 | 6,728
Impaired loans without an allowance | 5,994 | 5,551 | 5,368
Impaired loans with an allowance | 2,697 | 4,209 | 1,360
Related allowance recorded | 310 | 642 | 274
Year-to-date average loan balance | 9,745 | 10,017 | 7,374
Year-to-date interest income recognized | 603 | 569 | 601
One-to-Four Family Residential Real Estate Loans [Member] |  |  |
Unpaid contractual principal | 623 | 747 | 780
Impaired loan balance | 623 | 747 | 780
Impaired loans without an allowance | 413 | 503 | 780
Impaired loans with an allowance | 210 | 244 |
Related allowance recorded | 100 | 73 |
Year-to-date average loan balance | 640 | 774 | 798
Year-to-date interest income recognized | 10 | 8 | 7
Construction and Land Loan [Member] |  |  |
Unpaid contractual principal | 3,543 | 3,766 | 3,672
Impaired loan balance | 1,808 | 2,031 | 1,937
Impaired loans without an allowance | 1,383 | 430 | 1,937
Impaired loans with an allowance | 425 | 1,601 |
Related allowance recorded | 103 | 102 |
Year-to-date average loan balance | 2,689 | 2,033 | 2,068
Year-to-date interest income recognized | 53 | 65 | 72
Commercial Real Estate Loans [Member] |  |  |
Unpaid contractual principal | 3,912 | 3,973 | 2,445
Impaired loan balance | 3,912 | 3,973 | 2,445
Impaired loans without an allowance | 2,120 | 3,888 | 2,145
Impaired loans with an allowance | 1,792 | 85 | 300
Related allowance recorded | 67 | 52 | 81
Year-to-date average loan balance | 3,928 | 3,989 | 2,587
Year-to-date interest income recognized | 487 | 490 | 505
Commercial Loans [Member] |  |  |
Unpaid contractual principal | 1,528 | 2,002 | 355
Impaired loan balance | 1,528 | 2,002 | 355
Impaired loans without an allowance | 1,446 | 11 | 46
Impaired loans with an allowance | 82 | 1,991 | 309
Related allowance recorded | 27 | 391 | 87
Year-to-date average loan balance | 1,537 | 2,082 | 425
Year-to-date interest income recognized |  |  | 2
Agriculture Loans [Member] |  |  |
Unpaid contractual principal | 932 | 1,048 | 1,173
Impaired loan balance | 717 | 833 | 881
Impaired loans without an allowance | 529 | 545 | 147
Impaired loans with an allowance | 188 | 288 | 734
Related allowance recorded | 13 | 24 | 89
Year-to-date average loan balance | 844 | 912 | 1,000
Year-to-date interest income recognized | 52 | 1 | 2
Municipal Loans [Member] |  |  |
Unpaid contractual principal | 58 | 140 | 258
Impaired loan balance | 58 | 140 | 258
Impaired loans without an allowance | 58 | 140 | 258
Impaired loans with an allowance |  |  |
Related allowance recorded |  |  |
Year-to-date average loan balance | 58 | 192 | 418
Year-to-date interest income recognized | 1 | 5 |
Consumer Loans [Member] |  |  |
Unpaid contractual principal | 45 | 34 | 72
Impaired loan balance | 45 | 34 | 72
Impaired loans without an allowance | 45 | 34 | 55
Impaired loans with an allowance |  |  | 17
Related allowance recorded |  |  | 17
Year-to-date average loan balance | 49 | 35 | 78
Year-to-date interest income recognized |  |  | $ 13

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