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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Unpaid contractual principal	$ 13,016	$ 10,641
Impaired loan balance	11,025	8,691
Impaired loans without an allowance	7,956	5,994
Impaired loans with an allowance	3,069	2,697
Related allowance recorded	651	310
Year-to-date average loan balance	11,213	9,745
Year-to-date interest income recognized	296	603
One-to-Four Family Residential Real Estate Loans [Member]
Unpaid contractual principal	1,413	623
Impaired loan balance	1,372	623
Impaired loans without an allowance	1,172	413
Impaired loans with an allowance	200	210
Related allowance recorded	72	100
Year-to-date average loan balance	1,430	640
Year-to-date interest income recognized	5	10
Construction and Land Loan [Member]
Unpaid contractual principal	3,784	3,543
Impaired loan balance	2,049	1,808
Impaired loans without an allowance	1,429	1,383
Impaired loans with an allowance	620	425
Related allowance recorded	191	103
Year-to-date average loan balance	2,137	2,689
Year-to-date interest income recognized	20	53
Commercial Real Estate Loans [Member]
Unpaid contractual principal	5,248	3,912
Impaired loan balance	5,248	3,912
Impaired loans without an allowance	3,289	2,120
Impaired loans with an allowance	1,959	1,792
Related allowance recorded	274	67
Year-to-date average loan balance	5,264	3,928
Year-to-date interest income recognized	237	487
Commercial Loans [Member]
Unpaid contractual principal	1,700	1,528
Impaired loan balance	1,700	1,528
Impaired loans without an allowance	1,410	1,446
Impaired loans with an allowance	290	82
Related allowance recorded	114	27
Year-to-date average loan balance	1,711	1,537
Year-to-date interest income recognized	10
Agriculture Loans [Member]
Unpaid contractual principal	775	932
Impaired loan balance	560	717
Impaired loans without an allowance	560	529
Impaired loans with an allowance		188
Related allowance recorded		13
Year-to-date average loan balance	572	844
Year-to-date interest income recognized	23	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	38	45
Impaired loan balance	38	45
Impaired loans without an allowance	38	45
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	41	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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