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Loans and Allowance for Loan Losses - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans Receivable
Impaired Financing Receivable, Recorded Investment	$ 9,048	$ 10,267	$ 13,939
Impaired Financing Receivable, Unpaid Principal Balance	10,109	11,435	15,579
Impaired Financing Receivable, Related Allowance	713	929	2,041
Impaired Financing Receivable, Average Recorded Investment	9,739	12,487	20,004
Impaired Financing Receivable Interest Income Recognized	533	839	1,346
Commercial construction
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Commercial Real Estate
Impaired Financing Receivable, Recorded Investment	3,438	4,020	3,501
Impaired Financing Receivable, Unpaid Principal Balance	3,472	4,049	3,665
Impaired Financing Receivable, Related Allowance	445	517	613
Impaired Financing Receivable, Average Recorded Investment	3,736	4,940	6,216
Impaired Financing Receivable Interest Income Recognized	135	264	337
Industrial revenue bonds
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Consumer auto
Impaired Financing Receivable, Recorded Investment	865	1,117	1,874
Impaired Financing Receivable, Unpaid Principal Balance	964	1,334	2,114
Impaired Financing Receivable, Related Allowance	140	181	336
Impaired Financing Receivable, Average Recorded Investment	932	1,128	2,069
Impaired Financing Receivable Interest Income Recognized	91	125	167
Home Equity Line of Credit
Impaired Financing Receivable, Recorded Investment	630	528	111
Impaired Financing Receivable, Unpaid Principal Balance	668	548	128
Impaired Financing Receivable, Related Allowance	5	4	17
Impaired Financing Receivable, Average Recorded Investment	550	362	412
Impaired Financing Receivable Interest Income Recognized	36	37	28
Land development
Impaired Financing Receivable, Recorded Investment	0	0	14
Impaired Financing Receivable, Unpaid Principal Balance	0	0	18
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	328	14
Impaired Financing Receivable Interest Income Recognized	0	101	1
One- to four-family residential construction
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Subdivision construction
Impaired Financing Receivable, Recorded Investment	20	251	318
Impaired Financing Receivable, Unpaid Principal Balance	20	251	318
Impaired Financing Receivable, Related Allowance	0	96	105
Impaired Financing Receivable, Average Recorded Investment	115	277	321
Impaired Financing Receivable Interest Income Recognized	3	9	17
Owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	3,457	2,300	3,576
Impaired Financing Receivable, Unpaid Principal Balance	3,776	2,423	3,926
Impaired Financing Receivable, Related Allowance	90	82	285
Impaired Financing Receivable, Average Recorded Investment	2,999	2,598	3,406
Impaired Financing Receivable Interest Income Recognized	169	131	197
Non-owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	69	409	2,222
Impaired Financing Receivable, Unpaid Principal Balance	106	574	2,519
Impaired Financing Receivable, Related Allowance	0	20	304
Impaired Financing Receivable, Average Recorded Investment	309	954	2,870
Impaired Financing Receivable Interest Income Recognized	18	43	158
Other residential
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	1,026
Impaired Financing Receivable Interest Income Recognized	0	0	20
Commercial business
Impaired Financing Receivable, Recorded Investment	166	1,286	1,844
Impaired Financing Receivable, Unpaid Principal Balance	551	1,771	2,207
Impaired Financing Receivable, Related Allowance	14	13	309
Impaired Financing Receivable, Average Recorded Investment	800	1,517	2,932
Impaired Financing Receivable Interest Income Recognized	34	81	362
Consumer other
Impaired Financing Receivable, Recorded Investment	403	356	479
Impaired Financing Receivable, Unpaid Principal Balance	552	485	684
Impaired Financing Receivable, Related Allowance	19	16	72
Impaired Financing Receivable, Average Recorded Investment	298	383	738
Impaired Financing Receivable Interest Income Recognized	$ 47	$ 48	$ 59

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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
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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