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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Unpaid contractual principal	$ 11,935	$ 10,641
Impaired loan balance	9,985	8,691
Impaired loans without an allowance	7,194	5,994
Impaired loans with an allowance	2,791	2,697
Related allowance recorded	455	310
Year-to-date average loan balance	10,047	9,745
Year-to-date interest income recognized	143	603
One-to-Four Family Residential Real Estate Loans [Member]
Unpaid contractual principal	958	623
Impaired loan balance	958	623
Impaired loans without an allowance	681	413
Impaired loans with an allowance	277	210
Related allowance recorded	115	100
Year-to-date average loan balance	961	640
Year-to-date interest income recognized	3	10
Construction and Land Loan [Member]
Unpaid contractual principal	3,501	3,543
Impaired loan balance	1,766	1,808
Impaired loans without an allowance	1,341	1,383
Impaired loans with an allowance	425	425
Related allowance recorded	97	103
Year-to-date average loan balance	1,782	2,689
Year-to-date interest income recognized	10	53
Commercial Real Estate Loans [Member]
Unpaid contractual principal	3,986	3,912
Impaired loan balance	3,986	3,912
Impaired loans without an allowance	2,023	2,120
Impaired loans with an allowance	1,963	1,792
Related allowance recorded	223	67
Year-to-date average loan balance	3,992	3,928
Year-to-date interest income recognized	118	487
Commercial Loans [Member]
Unpaid contractual principal	1,567	1,528
Impaired loan balance	1,567	1,528
Impaired loans without an allowance	1,441	1,446
Impaired loans with an allowance	126	82
Related allowance recorded	20	27
Year-to-date average loan balance	1,570	1,537
Year-to-date interest income recognized
Agriculture Loans [Member]
Unpaid contractual principal	1,824	932
Impaired loan balance	1,609	717
Impaired loans without an allowance	1,609	529
Impaired loans with an allowance		188
Related allowance recorded		13
Year-to-date average loan balance	1,641	844
Year-to-date interest income recognized	12	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
Consumer Loans [Member]
Unpaid contractual principal	41	45
Impaired loan balance	41	45
Impaired loans without an allowance	41	45
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	43	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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