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Loans - Net Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	$ 4,111,857		$ 3,806,617
Less: allowance for credit losses	(39,031)	$ (39,274)	(38,973)	$ (39,493)	$ (43,197)	$ (37,607)
Net loans held-for-investment	4,072,826		3,767,644
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	4,098,721		3,790,798
Less: allowance for credit losses	(34,873)	(34,644)	(34,241)	(34,673)	(37,915)	(36,726)
PCD loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans held-for-investment, net	13,136		15,819
Less: allowance for credit losses	(4,158)	(4,630)	(4,732)	(4,820)	(5,282)	(881)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,962,987		3,647,778
Total loans held-for-investment, net	3,962,987		3,647,778
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,771,002		2,518,065
Total loans held-for-investment, net	2,771,002		2,518,065
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	850,186		808,597
Total loans held-for-investment, net	850,186		808,597
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One-to-four family residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	185,376		183,665
Total loans held-for-investment, net	185,376		183,665
Less: allowance for credit losses	(3,005)	(3,589)	(3,545)	(4,610)	(5,172)	(207)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Home equity and lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans	137,868		109,956
Total loans held-for-investment, net	137,868		109,956
Less: allowance for credit losses	(802)	(679)	(560)	(663)	(643)	(260)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Construction and land
Loans and Leases Receivable Disclosure [Line Items]
Loans	18,555		27,495
Total loans held-for-investment, net	18,555		27,495
Less: allowance for credit losses	(285)	(166)	(169)	(259)	(269)	(1,214)
Commercial and industrial and other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	135,734		143,020
Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	133,422		141,005
Total loans held-for-investment, net	133,422		141,005
Less: allowance for credit losses	(2,705)	(2,954)	(3,173)	(2,594)	(2,940)	(1,842)
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,312		2,015
Total loans held-for-investment, net	2,312		2,015
Less: allowance for credit losses	(11)	$ (9)	(9)	$ (7)	$ (9)	$ (198)
Paycheck Protection Program | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 11,900		$ 40,500

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Section 50
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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
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-URI https://asc.fasb.org/extlink&oid=6378536&loc=d3e10095-111533

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