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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Balance	$ 5,835	$ 5,326	$ 5,459	$ 5,344
Charge-offs	(401)	(84)	(507)	(329)
Recoveries	5	37	37	114
Provision for loan losses	450	100	900	250
Balance	5,889	5,379	5,889	5,379
Individually evaluated for loss					$ 870	$ 642
Collectively evaluated for loss					5,019	4,817
Total	5,889	5,326	5,459	5,344	5,889	5,459
Individually evaluated for loss					9,103	9,760
Collectively evaluated for loss					472,301	429,476
Total					481,404	439,236
One-To-Four Family Residential Real Estate Loan [Member]
Balance	439	499	542	504
Charge-offs				(19)
Recoveries	1	1	3	9
Provision for loan losses	109		4	6
Balance	549	500	549	500
Individually evaluated for loss					190	73
Collectively evaluated for loss					359	469
Total	549	500	542	504	549	542
Individually evaluated for loss					773	747
Collectively evaluated for loss					136,222	135,468
Total					136,995	136,215
Construction and Land Loan [Member]
Balance	109	70	181	53
Charge-offs
Recoveries
Provision for loan losses	6	33	(66)	50
Balance	115	103	115	103
Individually evaluated for loss						102
Collectively evaluated for loss					115	79
Total	115	103	181	103	115	181
Individually evaluated for loss					1,616	2,031
Collectively evaluated for loss					29,225	17,325
Total					30,841	19,356
Commercial Real Estate Loan [Member]
Balance	1,466	1,709	1,540	1,777
Charge-offs				(61)
Recoveries			1
Provision for loan losses	(19)	11	(94)	4
Balance	1,447	1,720	1,447	1,720
Individually evaluated for loss					13	52
Collectively evaluated for loss					1,434	1,488
Total	1,447	1,720	1,540	1,777	1,447	1,540
Individually evaluated for loss					3,916	3,973
Collectively evaluated for loss					124,376	116,651
Total					128,292	120,624
Commercial Loan [Member]
Balance	1,693	1,081	1,226	1,119
Charge-offs	(352)		(381)
Recoveries	1	10	3	19
Provision for loan losses	191	(82)	685	(129)
Balance	1,533	1,009	1,533	1,009
Individually evaluated for loss					666	391
Collectively evaluated for loss					867	835
Total	1,533	1,081	1,533	1,009	1,533	1,226
Individually evaluated for loss					2,013	2,002
Collectively evaluated for loss					65,885	52,589
Total					67,898	54,591
Agriculture Loan [Member]
Balance	2,005	1,772	1,812	1,684
Charge-offs
Recoveries				1
Provision for loan losses	99	87		174
Balance	2,104	1,859	2,104	1,859
Individually evaluated for loss						24
Collectively evaluated for loss					2,104	1,788
Total	2,104	1,859	1,812	1,684	2,104	1,812
Individually evaluated for loss					647	833
Collectively evaluated for loss					90,729	82,175
Total					91,376	83,008
Municipal Loan [Member]
Balance	7	10	8	12
Charge-offs
Recoveries		14	2	14
Provision for loan losses		(15)	(3)	(17)
Balance	7	9	7	9
Individually evaluated for loss
Collectively evaluated for loss					7	8
Total	7	9	8	12	7	8
Individually evaluated for loss					58	140
Collectively evaluated for loss					2,932	3,256
Total					2,990	3,396
Consumer Loan [Member]
Balance	116	185	150	195
Charge-offs	(49)	(84)	(126)	(249)
Recoveries	3	12	28	71
Provision for loan losses	64	66	82	162
Balance	134	179	134	179
Individually evaluated for loss					1
Collectively evaluated for loss					133	150
Total	$ 134	$ 179	134	$ 195	134	150
Individually evaluated for loss					80	34
Collectively evaluated for loss					22,932	22,012
Total					$ 23,012	$ 22,046
Agriculture Loan [Member]
Charge-offs
Recoveries
Provision for loan losses			$ 292

X

- 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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