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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

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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