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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) Number	Dec. 31, 2018 USD ($) Number
One-to-Four Family Residential Real Estate Loans [Member]
Troubled debt restructurings, Number of loans | Number	2	2
Financing receivable, modifications, recorded investment, non accrual balance
Financing receivable, modifications, recorded investment, accruing balance	$ 179	$ 181
Construction and Land Loan [Member]
Troubled debt restructurings, Number of loans | Number	4	4
Financing receivable, modifications, recorded investment, non accrual balance	$ 521	$ 523
Financing receivable, modifications, recorded investment, accruing balance	$ 820	$ 860
Commercial Real Estate Loans [Member]
Troubled debt restructurings, Number of loans | Number	1	2
Financing receivable, modifications, recorded investment, non accrual balance
Financing receivable, modifications, recorded investment, accruing balance	$ 2,024	$ 2,121
Commercial Loans [Member]
Troubled debt restructurings, Number of loans | Number	1	1
Financing receivable, modifications, recorded investment, non accrual balance	$ 32	$ 36
Financing receivable, modifications, recorded investment, accruing balance
Agriculture Loans [Member]
Troubled debt restructurings, Number of loans | Number	4	4
Municipal Loans [Member]
Troubled debt restructurings, Number of loans | Number	1	1
Financing receivable, modifications, recorded investment, non accrual balance
Financing receivable, modifications, recorded investment, accruing balance	$ 58	$ 58
Troubled Debt Restructurings [Member]
Troubled debt restructurings, Number of loans | Number	13	14
Financing receivable, modifications, recorded investment, non accrual balance	$ 559	$ 582
Financing receivable, modifications, recorded investment, accruing balance	3,297	3,455
Agriculture Loans [Member]
Financing receivable, modifications, recorded investment, non accrual balance	6	23
Financing receivable, modifications, recorded investment, accruing balance	$ 216	$ 235

X

- Definition

The amount of the outstanding recorded investment related to accruing balance of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

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X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

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