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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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