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Loans - Details and Delinquency Status of Nonperforming Loans (detail, and delinquency status, of non-performing loans (Non-Accrual Loans and Loans Past Due 90 Days or More and Still Accruing) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	$ 3,806,617	$ 3,823,238
Non-accrual loans	7,622
90 Days or More Past Due and Accruing	384	1,100
Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,882
Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	5,117
Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	314
Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	281
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	28
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	8,006	9,629
Non-accrual loans	7,622	8,516
90 Days or More Past Due and Accruing	384	1,113
Non-Performing Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	7,906	9,153
Non-accrual loans	7,594	8,479
90 Days or More Past Due and Accruing	312	674
Non-Performing Loans | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	1,882	1,153
Non-accrual loans	1,882	1,153
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	5,264	6,729
Non-accrual loans	5,117	6,229
90 Days or More Past Due and Accruing	147	500
Non-Performing Loans | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	479	1,080
Non-accrual loans	314	906
90 Days or More Past Due and Accruing	165	174
Non-Performing Loans | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	281	191
Non-accrual loans	281	191
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	100	473
Non-accrual loans	28	37
90 Days or More Past Due and Accruing	72	436
Non-Performing Loans | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		3
Non-accrual loans		0
90 Days or More Past Due and Accruing		3
Non-Performing Loans | Substandard | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	1,882	1,153
Non-accrual loans	1,882	1,153
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Substandard | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	4,984	6,229
Non-accrual loans	4,837	6,229
90 Days or More Past Due and Accruing	147	0
Non-Performing Loans | Substandard | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	479	1,080
Non-accrual loans	314	906
90 Days or More Past Due and Accruing	165	174
Non-Performing Loans | Substandard | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	281	191
Non-accrual loans	281	191
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Substandard | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	28	287
Non-accrual loans	28	37
90 Days or More Past Due and Accruing	0	250
Non-Performing Loans | Special Mention | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280
Non-accrual loans	280
90 Days or More Past Due and Accruing	0
Non-Performing Loans | Special Mention | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		85
Non-accrual loans		0
90 Days or More Past Due and Accruing		85
Non-Performing Loans | Pass | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		500
Non-accrual loans		0
90 Days or More Past Due and Accruing		500
Non-Performing Loans | Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	72	101
Non-accrual loans	0	0
90 Days or More Past Due and Accruing	72	101
Non-Performing Loans | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		3
Non-accrual loans		0
90 Days or More Past Due and Accruing		3
Non-Performing Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	2,972	3,302
Non-Performing Loans | Current | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	2,944	3,302
Non-Performing Loans | Current | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | Current | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	2,944	2,829
Non-Performing Loans | Current | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	413
Non-Performing Loans | Current | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	60
Non-Performing Loans | Current | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	28	0
Non-Performing Loans | Current | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | Current | Substandard | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | Current | Substandard | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	2,944	2,829
Non-Performing Loans | Current | Substandard | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	413
Non-Performing Loans | Current | Substandard | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	60
Non-Performing Loans | Current | Substandard | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	28	0
Non-Performing Loans | Current | Special Mention | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0
Non-Performing Loans | Current | Special Mention | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | Current | Pass | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | Current | Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | Current | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280	537
Non-Performing Loans | 30-89 Days Past Due | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280	537
Non-Performing Loans | 30-89 Days Past Due | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280	0
Non-Performing Loans | 30-89 Days Past Due | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	537
Non-Performing Loans | 30-89 Days Past Due | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	537
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Special Mention | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0
Non-Performing Loans | 30-89 Days Past Due | Special Mention | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Pass | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	4,370	4,677
Non-Performing Loans | 90 Days or More Past Due | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	4,370	4,640
Non-Performing Loans | 90 Days or More Past Due | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	1,602	1,153
Non-Performing Loans | 90 Days or More Past Due | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	2,173	2,863
Non-Performing Loans | 90 Days or More Past Due | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	314	493
Non-Performing Loans | 90 Days or More Past Due | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	281	131
Non-Performing Loans | 90 Days or More Past Due | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	37
Non-Performing Loans | 90 Days or More Past Due | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	1,602	1,153
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	1,893	2,863
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real Estate | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	314	493
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real Estate | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	281	131
Non-Performing Loans | 90 Days or More Past Due | Substandard | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	0	37
Non-Performing Loans | 90 Days or More Past Due | Special Mention | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	280
Non-Performing Loans | 90 Days or More Past Due | Special Mention | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Pass | Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net	$ 0	0
Non-Performing Loans | 90 Days or More Past Due | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-investment, net		$ 0

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