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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unpaid contractual principal | $ 10,800 | $ 10,641 | $ 11,710
Impaired loan balance | 8,680 | 8,691 | 9,760
Impaired loans without an allowance | 6,524 | 5,994 | 5,551
Impaired loans with an allowance | 2,156 | 2,697 | 4,209
Related allowance recorded | 733 | 310 | 642
Year-to-date average loan balance | 9,104 | 9,745 | 10,017
Year-to-date interest income recognized | 584 | 603 | 569
One-to-Four Family Residential Real Estate Loans [Member] |  |  |
Unpaid contractual principal | 1,297 | 623 | 747
Impaired loan balance | 1,256 | 623 | 747
Impaired loans without an allowance | 887 | 413 | 503
Impaired loans with an allowance | 369 | 210 | 244
Related allowance recorded | 129 | 100 | 73
Year-to-date average loan balance | 1,291 | 640 | 774
Year-to-date interest income recognized | 10 | 10 | 8
Construction and Land Loan [Member] |  |  |
Unpaid contractual principal | 3,214 | 3,543 | 3,766
Impaired loan balance | 1,479 | 1,808 | 2,031
Impaired loans without an allowance | 1,288 | 1,383 | 430
Impaired loans with an allowance | 191 | 425 | 1,601
Related allowance recorded | 191 | 103 | 102
Year-to-date average loan balance | 1,631 | 2,689 | 2,033
Year-to-date interest income recognized | 36 | 53 | 65
Commercial Real Estate Loans [Member] |  |  |
Unpaid contractual principal | 3,461 | 3,912 | 3,973
Impaired loan balance | 3,461 | 3,912 | 3,973
Impaired loans without an allowance | 3,258 | 2,120 | 3,888
Impaired loans with an allowance | 203 | 1,792 | 85
Related allowance recorded | 103 | 67 | 52
Year-to-date average loan balance | 3,489 | 3,928 | 3,989
Year-to-date interest income recognized | 478 | 487 | 490
Commercial Loans [Member] |  |  |
Unpaid contractual principal | 1,427 | 1,528 | 2,002
Impaired loan balance | 1,298 | 1,528 | 2,002
Impaired loans without an allowance | 416 | 1,446 | 11
Impaired loans with an allowance | 882 | 82 | 1,991
Related allowance recorded | 204 | 27 | 391
Year-to-date average loan balance | 1,464 | 1,537 | 2,082
Year-to-date interest income recognized | 11 |  |
Agriculture Loans [Member] |  |  |
Unpaid contractual principal | 1,339 | 932 | 1,048
Impaired loan balance | 1,124 | 717 | 833
Impaired loans without an allowance | 613 | 529 | 545
Impaired loans with an allowance | 511 | 188 | 288
Related allowance recorded | 106 | 13 | 24
Year-to-date average loan balance | 1,166 | 844 | 912
Year-to-date interest income recognized | 48 | 52 | 1
Municipal Loans [Member] |  |  |
Unpaid contractual principal | 58 | 58 | 140
Impaired loan balance | 58 | 58 | 140
Impaired loans without an allowance | 58 | 58 | 140
Impaired loans with an allowance |  |  |
Related allowance recorded |  |  |
Year-to-date average loan balance | 58 | 58 | 192
Year-to-date interest income recognized | 1 | 1 | 5
Consumer Loans [Member] |  |  |
Unpaid contractual principal | 4 | 45 | 34
Impaired loan balance | 4 | 45 | 34
Impaired loans without an allowance | 4 | 45 | 34
Impaired loans with an allowance |  |  |
Related allowance recorded |  |  |
Year-to-date average loan balance | 5 | 49 | 35
Year-to-date interest income recognized |  |  |

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