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Loans and Allowance for Loan Losses - Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unpaid contractual principal	$ 10,800	$ 10,641	$ 11,710
Impaired loan balance	8,680	8,691	9,760
Impaired loans without an allowance	6,524	5,994	5,551
Impaired loans with an allowance	2,156	2,697	4,209
Related allowance recorded	733	310	642
Year-to-date average loan balance	9,104	9,745	10,017
Year-to-date interest income recognized	584	603	569
One-to-Four Family Residential Real Estate Loans [Member]
Unpaid contractual principal	1,297	623	747
Impaired loan balance	1,256	623	747
Impaired loans without an allowance	887	413	503
Impaired loans with an allowance	369	210	244
Related allowance recorded	129	100	73
Year-to-date average loan balance	1,291	640	774
Year-to-date interest income recognized	10	10	8
Construction and Land Loan [Member]
Unpaid contractual principal	3,214	3,543	3,766
Impaired loan balance	1,479	1,808	2,031
Impaired loans without an allowance	1,288	1,383	430
Impaired loans with an allowance	191	425	1,601
Related allowance recorded	191	103	102
Year-to-date average loan balance	1,631	2,689	2,033
Year-to-date interest income recognized	36	53	65
Commercial Real Estate Loans [Member]
Unpaid contractual principal	3,461	3,912	3,973
Impaired loan balance	3,461	3,912	3,973
Impaired loans without an allowance	3,258	2,120	3,888
Impaired loans with an allowance	203	1,792	85
Related allowance recorded	103	67	52
Year-to-date average loan balance	3,489	3,928	3,989
Year-to-date interest income recognized	478	487	490
Commercial Loans [Member]
Unpaid contractual principal	1,427	1,528	2,002
Impaired loan balance	1,298	1,528	2,002
Impaired loans without an allowance	416	1,446	11
Impaired loans with an allowance	882	82	1,991
Related allowance recorded	204	27	391
Year-to-date average loan balance	1,464	1,537	2,082
Year-to-date interest income recognized	11
Agriculture Loans [Member]
Unpaid contractual principal	1,339	932	1,048
Impaired loan balance	1,124	717	833
Impaired loans without an allowance	613	529	545
Impaired loans with an allowance	511	188	288
Related allowance recorded	106	13	24
Year-to-date average loan balance	1,166	844	912
Year-to-date interest income recognized	48	52	1
Municipal Loans [Member]
Unpaid contractual principal	58	58	140
Impaired loan balance	58	58	140
Impaired loans without an allowance	58	58	140
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	58	58	192
Year-to-date interest income recognized	1	1	5
Consumer Loans [Member]
Unpaid contractual principal	4	45	34
Impaired loan balance	4	45	34
Impaired loans without an allowance	4	45	34
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance	5	49	35
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
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