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Loans - Net Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	$ 3,806,617	$ 3,823,238
Allowance for credit losses	(38,973)	(37,607)	$ (28,707)	$ (27,497)
Net loans held-for-investment	3,767,644	3,785,631
Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Deferred origination loan fees, net	0	4,795
Total loans held-for-investment, net	3,790,798	3,804,720
PCD/PCI Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	15,819	18,518
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	3,790,798	3,804,720
Allowance for credit losses	(34,241)	(36,726)	(27,918)
Real Estate | Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,647,778	3,602,544
Real Estate | Financial Asset Originated | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,518,065	2,509,310
Real Estate | Financial Asset Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	808,597	716,973
Real Estate | Financial Asset Originated | One-to-four family residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	183,665	210,817
Real Estate | Financial Asset Originated | Home Equity and Lines of Credit
Loans and Leases Receivable Disclosure [Line Items]
Loans	109,956	91,126
Real Estate | Financial Asset Originated | Construction and land
Loans and Leases Receivable Disclosure [Line Items]
Loans	27,495	74,318
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	3,647,778	3,610,210
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	2,518,065	2,512,934
Allowance for credit losses		(26,995)	(20,203)
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	808,597	717,566
Allowance for credit losses		(6,010)	(4,891)
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One-to-four family residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	183,665	212,222
Allowance for credit losses	(3,545)	(207)	(180)
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Home Equity and Lines of Credit
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	109,956	93,137
Allowance for credit losses	(560)	(260)	(317)
Real Estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Construction and land
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	27,495	74,351
Allowance for credit losses	(169)	(1,214)	(536)
Commercial and Industrial and Other Portfolio Segment | Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Loans	143,020	197,381
Commercial and Industrial | Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Loans	141,005	194,352
Commercial and Industrial | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	141,005	191,481
Allowance for credit losses	(3,173)	(1,842)	(1,640)
Other loans | Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,015	3,029
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	2,015	3,029
Allowance for credit losses	(9)	(198)	$ (151)
Paycheck Protection Program | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 40,500	$ 126,500

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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