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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Jun. 30, 2022
Financing Receivable, Impaired [Line Items]
Recorded Balance	$ 1,136	$ 1,136	$ 1,385
Unpaid Principal Balance	1,136	1,136	1,385
Specific Allowance	0	0	0
Average Investment in Impaired Loans	1,141	1,144	1,401
Interest Income Recognized	7	12	19
Interest on Cash Basis	5	10	17
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	41	41	35
Unpaid Principal Balance, Loans without a specific valuation allowance	41	41	35
Average Investment in Impaired Loans, Loans without a specific valuation allowance	42	43	40
Interest Income Recognized, Loans without a specific valuation allowance	1	2	4
Interest on Cash Basis, Loans without a specific valuation allowance	1	2	4
Recorded Balance	41	41	35
Unpaid Principal Balance	41	41	35
Average Investment in Impaired Loans	42	43	40
Interest Income Recognized	1	2	4
Interest on Cash Basis	1	2	4
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	12	12
Unpaid Principal Balance, Loans without a specific valuation allowance	12	12
Average Investment in Impaired Loans, Loans without a specific valuation allowance	14	14
Recorded Balance	12	12
Unpaid Principal Balance	12	12
Average Investment in Impaired Loans	14	14
One- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	1,083	1,083	1,350
Unpaid Principal Balance, Loans without a specific valuation allowance	1,083	1,083	1,350
Average Investment in Impaired Loans, Loans without a specific valuation allowance	1,085	1,087	1,361
Interest Income Recognized, Loans without a specific valuation allowance	6	10	15
Interest on Cash Basis, Loans without a specific valuation allowance	4	8	13
Recorded Balance	1,083	1,083	1,350
Unpaid Principal Balance	1,083	1,083	1,350
Average Investment in Impaired Loans	1,085	1,087	1,361
Interest Income Recognized	6	10	15
Interest on Cash Basis	$ 4	$ 8	$ 13

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