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Loans - Net Loans Held-for-Investment (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans held-for-investment, net | $ 3,589,359,000 |  | $ 3,437,085,000 |  |  |
Allowance for loan losses | (38,520,000) | $ (36,800,000) | (28,707,000) | $ (27,832,000) | $ (27,486,000) | $ (27,497,000)
Net loans held-for-investment | 3,550,839,000 |  | 3,408,378,000 |  |  |
Originated |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 155,290,000 |  | 47,411,000 |  |  |
Deferred loan cost, net | 4,380,000 |  | 7,614,000 |  |  |
Loans held-for-investment, net | 3,213,689,000 |  | 2,987,067,000 |  |  |
Allowance for loan losses | (37,541,000) | (35,956,000) | (27,783,000) | (26,687,000) | (26,476,000) | (26,487,000)
Purchased Credit-Impaired |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans held-for-investment, net | 14,775,000 |  | 17,365,000 |  |  |
Allowance for loan losses | (789,000) | (789,000) | (789,000) | (1,010,000) | (1,010,000) | (1,010,000)
Acquired Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 360,895,000 |  | 432,653,000 |  |  |
Loans held-for-investment, net | 360,895,000 |  | 432,653,000 |  |  |
Allowance for loan losses | (190,000) | (55,000) | (135,000) | (135,000) | 0 | 0
Real Estate | Originated |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 3,054,019,000 |  | 2,932,042,000 |  |  |
Real Estate | Originated | Multifamily |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 2,300,773,000 |  | 2,196,407,000 |  |  |
Loans held-for-investment, net | 2,304,166,000 |  | 2,199,734,000 |  |  |
Allowance for loan losses | (27,243,000) | (26,889,000) | (20,203,000) | (18,384,000) | (18,346,000) | (18,084,000)
Real Estate | Originated | Commercial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 535,629,000 |  | 528,681,000 |  |  |
Loans held-for-investment, net | 536,245,000 |  | 529,287,000 |  |  |
Allowance for loan losses | (6,509,000) | (5,389,000) | (4,756,000) | (5,331,000) | (5,382,000) | (5,630,000)
Real Estate | Originated | One-to-Four Family |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 82,697,000 |  | 83,742,000 |  |  |
Loans held-for-investment, net | 84,189,000 |  | 85,355,000 |  |  |
Allowance for loan losses | (272,000) | (312,000) | (180,000) | (234,000) | (370,000) | (342,000)
Real Estate | Originated | Home equity and lines of credit |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 88,105,000 |  | 84,928,000 |  |  |
Loans held-for-investment, net | 90,110,000 |  | 86,848,000 |  |  |
Allowance for loan losses | (558,000) | (574,000) | (317,000) | (417,000) | (336,000) | (291,000)
Real Estate | Originated | Construction and Land |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 46,815,000 |  | 38,284,000 |  |  |
Loans held-for-investment, net | 46,843,000 |  | 38,303,000 |  |  |
Allowance for loan losses | (937,000) | (671,000) | (536,000) | (584,000) | (574,000) | (463,000)
Real Estate | Acquired Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 352,861,000 |  | 423,964,000 |  |  |
Real Estate | Acquired Loans | Multifamily |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 95,835,000 |  | 108,417,000 |  |  |
Real Estate | Acquired Loans | Commercial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 98,281,000 |  | 113,027,000 |  |  |
Real Estate | Acquired Loans | One-to-Four Family |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 147,179,000 |  | 187,975,000 |  |  |
Real Estate | Acquired Loans | Home equity and lines of credit |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 10,091,000 |  | 12,008,000 |  |  |
Real Estate | Acquired Loans | Construction and Land |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 1,475,000 |  | 2,537,000 |  |  |
Commercial and Industrial | Originated |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 152,879,000 |  | 45,328,000 |  |  |
Loans held-for-investment, net | 149,725,000 |  | 45,456,000 |  |  |
Allowance for loan losses | (1,846,000) | (2,035,000) | (1,640,000) | (1,591,000) | (1,376,000) | (1,569,000)
Commercial and Industrial | Acquired Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 8,034,000 |  | 8,689,000 |  |  |
Other | Originated |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | 2,411,000 |  | 2,083,000 |  |  |
Loans held-for-investment, net | 2,411,000 |  | 2,084,000 |  |  |
Allowance for loan losses | (176,000) | $ (86,000) | (151,000) | $ (146,000) | $ (92,000) | $ (108,000)
Paycheck Protection Program | Originated |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans | $ 105,700,000 |  | $ 0 |  |  |

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