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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, 2019	Dec. 31, 2018
Unpaid contractual principal	$ 11,101	$ 10,641
Impaired loan balance	9,110	8,691
Impaired loans without an allowance	7,426	5,994
Impaired loans with an allowance	1,684	2,697
Related allowance recorded	663	310
Year-to-date average loan balance	7,874	9,745
Year-to-date interest income recognized	440	603
One-to-Four Family Residential Real Estate Loans [Member]
Unpaid contractual principal	1,266	623
Impaired loan balance	1,225	623
Impaired loans without an allowance	855	413
Impaired loans with an allowance	370	210
Related allowance recorded	316	100
Year-to-date average loan balance	1,253	640
Year-to-date interest income recognized	8	10
Construction and Land Loan [Member]
Unpaid contractual principal	3,275	3,543
Impaired loan balance	1,540	1,808
Impaired loans without an allowance	1,348	1,383
Impaired loans with an allowance	192	425
Related allowance recorded	7	103
Year-to-date average loan balance	195	2,689
Year-to-date interest income recognized	28	53
Commercial Real Estate Loans [Member]
Unpaid contractual principal	3,472	3,912
Impaired loan balance	3,472	3,912
Impaired loans without an allowance	3,269	2,120
Impaired loans with an allowance	203	1,792
Related allowance recorded	112	67
Year-to-date average loan balance	3,504	3,928
Year-to-date interest income recognized	357	487
Commercial Loans [Member]
Unpaid contractual principal	1,047	1,528
Impaired loan balance	1,047	1,528
Impaired loans without an allowance	128	1,446
Impaired loans with an allowance	919	82
Related allowance recorded	228	27
Year-to-date average loan balance	1,107	1,537
Year-to-date interest income recognized	11
Agriculture Loans [Member]
Unpaid contractual principal	1,979	932
Impaired loan balance	1,764	717
Impaired loans without an allowance	1,764	529
Impaired loans with an allowance		188
Related allowance recorded		13
Year-to-date average loan balance	1,753	844
Year-to-date interest income recognized	35	52
Municipal Loans [Member]
Unpaid contractual principal	58	58
Impaired loan balance	58	58
Impaired loans without an allowance	58	58
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	58	58
Year-to-date interest income recognized	1	1
Consumer Loans [Member]
Unpaid contractual principal	4	45
Impaired loan balance	4	45
Impaired loans without an allowance	4	45
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	4	49
Year-to-date interest income recognized

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
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