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Loans and Allowance for Loan Losses - Schedule of Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Balance	$ 6,266	$ 5,835	$ 5,765	$ 5,459
Charge-offs	(411)	(401)	(594)	(507)
Recoveries	24	5	108	37
Provision for loan losses	400	450	1,000	900
Balance	6,279	5,889	6,279	5,889
Individually evaluated for loss					$ 663	$ 310
Collectively evaluated for loss					5,616	5,455
Total	6,279	5,889	6,279	5,889	6,279	5,765
Individually evaluated for loss					9,110	8,691
Collectively evaluated for loss					517,329	486,556
Loans and Leases Receivable, Gross, Total					526,439	495,247
One-to-Four Family Residential Real Estate Loans [Member]
Balance	441	439	449	542
Charge-offs	(15)		(56)
Recoveries		1	1	3
Provision for loan losses	249	109	281	4
Balance	675	549	675	549
Individually evaluated for loss					316	100
Collectively evaluated for loss					359	349
Total	675	549	449	542	675	449
Individually evaluated for loss					1,225	623
Collectively evaluated for loss					140,576	136,272
Loans and Leases Receivable, Gross, Total					141,801	136,895
Construction and Land Loan [Member]
Balance	255	109	168	181
Charge-offs	(31)		(31)
Recoveries
Provision for loan losses	(156)	6	(69)	(66)
Balance	68	115	68	115
Individually evaluated for loss					7	103
Collectively evaluated for loss					61	65
Total	68	115	168	181	68	168
Individually evaluated for loss					1,540	1,808
Collectively evaluated for loss					18,162	18,275
Loans and Leases Receivable, Gross, Total					19,702	20,083
Commercial Real Estate Loans [Member]
Balance	1,758	1,466	1,686	1,540
Charge-offs
Recoveries				1
Provision for loan losses	(326)	(19)	(254)	(94)
Balance	1,432	1,447	1,432	1,447
Individually evaluated for loss					112	67
Collectively evaluated for loss					1,320	1,619
Total	1,432	1,447	1,686	1,540	1,432	1,686
Individually evaluated for loss					3,472	3,912
Collectively evaluated for loss					132,478	135,055
Loans and Leases Receivable, Gross, Total					135,950	138,967
Commercial Loans [Member]
Balance	1,404	1,693	1,051	1,226
Charge-offs	(284)	(352)	(324)	(381)
Recoveries	1	1	52	3
Provision for loan losses	490	191	832	685
Balance	1,611	1,533	1,611	1,533
Individually evaluated for loss					228	27
Collectively evaluated for loss					1,383	1,024
Total	1,611	1,533	1,051	1,226	1,611	1,051
Individually evaluated for loss					1,047	1,528
Collectively evaluated for loss					100,103	72,761
Loans and Leases Receivable, Gross, Total					101,150	74,289
Agriculture Loans [Member]
Balance	2,260	2,005	2,238	1,812
Charge-offs
Recoveries
Provision for loan losses	40	99	62	292
Balance	2,300	2,104	2,300	2,104
Individually evaluated for loss						13
Collectively evaluated for loss					2,300	2,225
Total	2,300	2,104	2,238	1,812	2,300	2,238
Individually evaluated for loss					1,764	717
Collectively evaluated for loss					99,194	95,915
Loans and Leases Receivable, Gross, Total					100,958	96,632
Municipal Loans [Member]
Balance	7	7	7	8
Charge-offs
Recoveries			6	2
Provision for loan losses	(1)		(7)	(3)
Balance	6	7	6	7
Individually evaluated for loss
Collectively evaluated for loss					6	7
Total	6	7	7	8	6	7
Individually evaluated for loss					58	58
Collectively evaluated for loss					2,670	2,895
Loans and Leases Receivable, Gross, Total					2,728	2,953
Consumer Loans [Member]
Balance	141	116	166	150
Charge-offs	(81)	(49)	(183)	(126)
Recoveries	23	3	49	28
Provision for loan losses	104	64	155	82
Balance	187	134	187	134
Individually evaluated for loss
Collectively evaluated for loss					187	166
Total	$ 187	$ 134	$ 166	$ 134	187	166
Individually evaluated for loss					4	45
Collectively evaluated for loss					24,146	25,383
Loans and Leases Receivable, Gross, Total					$ 24,150	$ 25,428

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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