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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, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | $ 11,209 | $ 8,755
Impaired loan balance | 9,259 | 6,728
Impaired loans without an allowance | 8,362 | 5,368
Impaired loans with an allowance | 897 | 1,360
Related allowance recorded | 250 | 274
Year-to-date average loan balance | 9,507 | 7,374
Year-to-date interest income recognized | 434 | 601
One-To-Four Family Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 531 | 780
Impaired loan balance | 531 | 780
Impaired loans without an allowance | 496 | 780
Impaired loans with an allowance | 35 |
Related allowance recorded | 15 |
Year-to-date average loan balance | 552 | 798
Year-to-date interest income recognized | 6 | 7
Construction and Land [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 3,818 | 3,672
Impaired loan balance | 2,083 | 1,937
Impaired loans without an allowance | 1,885 | 1,937
Impaired loans with an allowance | 198 |
Related allowance recorded | 36 |
Year-to-date interest income recognized | 49 | 72
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 3,999 | 2,445
Impaired loan balance | 3,999 | 2,445
Impaired loans without an allowance | 3,939 | 2,145
Impaired loans with an allowance | 60 | 300
Related allowance recorded | 53 | 81
Year-to-date interest income recognized | 368 | 505
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 1,579 | 355
Impaired loan balance | 1,579 | 355
Impaired loans without an allowance | 1,372 | 46
Impaired loans with an allowance | 207 | 309
Related allowance recorded | 35 | 87
Year-to-date average loan balance | 1,660 | 425
Year-to-date interest income recognized |  | 2
Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 1,098 | 1,173
Impaired loan balance | 883 | 881
Impaired loans without an allowance | 486 | 147
Impaired loans with an allowance | 397 | 734
Related allowance recorded | 111 | 89
Year-to-date average loan balance | 992 | 1,000
Year-to-date interest income recognized | 7 | 2
Municipal [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 140 | 258
Impaired loan balance | 140 | 258
Impaired loans without an allowance | 140 | 258
Impaired loans with an allowance |  |
Related allowance recorded |  |
Year-to-date average loan balance | 209 | 418
Year-to-date interest income recognized | 4 |
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid contractual principal | 44 | 72
Impaired loan balance | 44 | 72
Impaired loans without an allowance | 44 | 55
Impaired loans with an allowance |  | 17
Related allowance recorded |  | 17
Year-to-date average loan balance | 47 | 78
Year-to-date interest income recognized |  | 13
Construction and Land [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Year-to-date average loan balance | 2,030 | 2,068
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Year-to-date average loan balance | $ 4,017 | $ 2,587

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