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Loans and Allowance for Loan Losses - Schedule of Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance	$ (5,459)	$ 5,344	$ 5,922
Charge-offs	(1,160)	(488)	(1,166)
Recoveries	66	153	88
Provision for loan losses	1,400	450	500
Balance	(5,765)	(5,459)	5,344
Individually evaluated for loss				$ 310	$ 642	$ 274
Collectively evaluated for loss				5,455	4,817	5,070
Total	(5,459)	(5,459)	5,344	(5,765)	(5,459)	5,344
Individually evaluated for loss				8,691	9,760	6,728
Collectively evaluated for loss				486,556	429,476	419,041
Loans and Leases Receivable, Gross, Total				495,247	439,236	425,769
One-to-Four Family Residential Real Estate Loans [Member]
Balance	542	504	925
Charge-offs	(32)	(37)	(14)
Recoveries	4	11	9
Provision for loan losses	(65)	64	(416)
Balance	449	542	504
Individually evaluated for loss				100	73
Collectively evaluated for loss				349	469	504
Total	542	542	504	449	542	504
Individually evaluated for loss				623	747	780
Collectively evaluated for loss				136,272	135,468	136,066
Loans and Leases Receivable, Gross, Total				136,895	136,215	136,846
Construction and Land Loan [Member]
Balance	181	53	77
Charge-offs
Recoveries
Provision for loan losses	(13)	128	(24)
Balance	168	181	53
Individually evaluated for loss				103	102
Collectively evaluated for loss				65	79	53
Total	181	181	53	168	181	53
Individually evaluated for loss				1,808	2,031	1,937
Collectively evaluated for loss				18,275	17,325	11,801
Loans and Leases Receivable, Gross, Total				20,083	19,356	13,738
Commercial Real Estate Loans [Member]
Balance	1,540	1,777	1,740
Charge-offs		(71)
Recoveries	1
Provision for loan losses	145	(166)	37
Balance	1,686	1,540	1,777
Individually evaluated for loss				67	52	81
Collectively evaluated for loss				1,619	1,488	1,696
Total	1,540	1,540	1,777	1,686	1,540	1,777
Individually evaluated for loss				3,912	3,973	2,445
Collectively evaluated for loss				135,055	116,651	115,755
Loans and Leases Receivable, Gross, Total				138,967	120,624	118,200
Commercial Loans [Member]
Balance	1,226	1,119	1,530
Charge-offs	(950)		(306)
Recoveries	22	20	34
Provision for loan losses	753	87	(139)
Balance	1,051	1,226	1,119
Individually evaluated for loss				27	391	87
Collectively evaluated for loss				1,024	835	1,032
Total	1,051	1,226	1,119	1,051	1,226	1,119
Individually evaluated for loss				1,528	2,002	355
Collectively evaluated for loss				72,761	52,589	54,151
Loans and Leases Receivable, Gross, Total				74,289	54,591	54,506
Agriculture Loans [Member]
Balance	1,812	1,684	1,428
Charge-offs		(45)	(375)
Recoveries	1	1
Provision for loan losses	425	172	631
Balance	2,238	1,812	1,684
Individually evaluated for loss				13	24	89
Collectively evaluated for loss				2,225	1,788	1,595
Total	1,812	1,812	1,684	2,238	1,812	1,684
Individually evaluated for loss				717	833	881
Collectively evaluated for loss				95,915	82,175	77,443
Loans and Leases Receivable, Gross, Total				96,632	83,008	78,324
Municipal Loans [Member]
Balance	8	12	23
Charge-offs
Recoveries	2	37	6
Provision for loan losses	(3)	(41)	(17)
Balance	7	8	12
Individually evaluated for loss
Collectively evaluated for loss				7	8	12
Total	8	8	12	7	8	12
Individually evaluated for loss				58	140	258
Collectively evaluated for loss				2,895	3,256	3,626
Loans and Leases Receivable, Gross, Total				2,953	3,396	3,884
Consumer Loans [Member]
Balance	150	195	199
Charge-offs	(178)	(335)	(471)
Recoveries	36	84	39
Provision for loan losses	158	206	428
Balance	166	150	195
Individually evaluated for loss						17
Collectively evaluated for loss				166	150	178
Total	$ 166	$ 195	$ 195	166	150	195
Individually evaluated for loss				45	34	72
Collectively evaluated for loss				25,383	22,012	20,199
Loans and Leases Receivable, Gross, Total				$ 25,428	$ 22,046	$ 20,271

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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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