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Loans and Allowance for Credit Losses - Troubled debt restructurings (TDRs) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Loans and Allowance for Credit Losses
TDR Loans, Number | contract	36	64
TDR loans, Balance	$ 2,949,000	$ 3,851,000
Consumer
Loans and Allowance for Credit Losses
TDR Loans, Number | contract	18	39
TDR loans, Balance	$ 252,000	$ 387,000
Commercial real estate
Loans and Allowance for Credit Losses
TDR Loans, Number | contract	2	2
TDR loans, Balance	$ 1,571,000	$ 1,811,000
Construction and Land Development [Member]
Loans and Allowance for Credit Losses
TDR Loans, Number | contract		1
TDR loans, Balance		$ 15,000
One- to four-family construction
Loans and Allowance for Credit Losses
TDR Loans, Number | contract	16	22
TDR loans, Balance	$ 1,126,000	$ 1,638,000
Accruing
Loans and Allowance for Credit Losses
TDR Loans, Number	26	38
TDR loans, Balance	$ 1,238,000	$ 1,002,000
Accruing | Consumer
Loans and Allowance for Credit Losses
TDR Loans, Number	13	26
TDR loans, Balance	$ 210,000	$ 323,000
Accruing | Commercial real estate
Loans and Allowance for Credit Losses
TDR Loans, Number		1
TDR loans, Balance		$ 85,000
Accruing | Construction and Land Development [Member]
Loans and Allowance for Credit Losses
TDR Loans, Number		1
TDR loans, Balance		$ 15,000
Accruing | One- to four-family construction
Loans and Allowance for Credit Losses
TDR Loans, Number	13	10
TDR loans, Balance	$ 1,028,000	$ 579,000
Non-accruing
Loans and Allowance for Credit Losses
TDR Loans, Number	10	26
TDR loans, Balance	$ 1,711,000	$ 2,849,000
Non-accruing | Consumer
Loans and Allowance for Credit Losses
TDR Loans, Number	5	13
TDR loans, Balance	$ 42,000	$ 64,000
Non-accruing | Commercial real estate
Loans and Allowance for Credit Losses
TDR Loans, Number	2	1
TDR loans, Balance	$ 1,571,000	$ 1,726,000
Non-accruing | One- to four-family construction
Loans and Allowance for Credit Losses
TDR Loans, Number	3	12
TDR loans, Balance	$ 98,000	$ 1,059,000

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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