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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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