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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | $ 37,229,412 |  | $ 34,778,539 |  |  |
Allowance for loan losses | (632,071) |  | (358,287) |  |  |
Loans held-for-investment, net | 36,597,341 |  | 34,420,252 |  |  |
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts | (72,100) |  | (43,200) |  |  |
Commercial and industrial (“C&I”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (756) |  |  |  |  |
HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (76) |  |  |  |  |
Commercial lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 27,924,906 |  | 25,914,252 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 13,422,691 |  | 12,150,931 |  |  |
Allowance for loan losses | (380,723) | $ (362,629) | (238,376) | $ (205,503) | $ (189,757) | $ (189,117)
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 10,902,114 |  | 10,278,448 |  |  |
Allowance for loan losses | (176,040) | (132,819) | (40,509) | (39,811) | (39,224) | (40,666)
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 3,032,385 |  | 2,856,374 |  |  |
Allowance for loan losses | (25,058) | (16,530) | (22,826) | (19,280) | (19,169) | (19,885)
Commercial lending | Construction and land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 567,716 |  | 628,499 |  |  |
Allowance for loan losses | (18,551) | (11,018) | (19,404) | (22,961) | (22,349) | (20,290)
Commercial lending | Total CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 14,502,215 |  | 13,763,321 |  |  |
Consumer lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 9,304,506 |  | 8,864,287 |  |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 7,660,094 |  | 7,108,590 |  |  |
Allowance for loan losses | (25,314) | (26,822) | (28,527) | (32,763) | (35,759) | (31,340)
Consumer lending | HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 1,461,951 |  | 1,472,783 |  |  |
Allowance for loan losses | (3,867) | (3,881) | (5,265) | (6,177) | (7,401) | (5,774)
Consumer lending | Total residential mortgage |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 9,122,045 |  | 8,581,373 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 182,461 |  | 282,914 |  |  |
Allowance for loan losses | $ (2,518) | $ (3,304) | (3,380) | $ (4,130) | $ (4,235) | $ (4,250)
Non-PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 34,555,668 |  |  |
Allowance for loan losses |  |  | (358,287) |  |  |
Loans held-for-investment, net |  |  | 34,197,381 |  |  |
Non-PCI Loans | Commercial lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 25,777,039 |  |  |
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 12,149,121 |  |  |
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 10,165,247 |  |  |
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 2,834,212 |  |  |
Non-PCI Loans | Commercial lending | Construction and land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 628,459 |  |  |
Non-PCI Loans | Commercial lending | Total CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 13,627,918 |  |  |
Non-PCI Loans | Consumer lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 8,778,629 |  |  |
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 7,028,979 |  |  |
Non-PCI Loans | Consumer lending | HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 1,466,736 |  |  |
Non-PCI Loans | Consumer lending | Total residential mortgage |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 8,495,715 |  |  |
Non-PCI Loans | Consumer lending | Other consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 282,914 |  |  |
PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 222,871 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
Loans held-for-investment, net |  |  | 222,871 |  |  |
PCI Loans | Commercial lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 137,213 |  |  |
PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 1,810 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 113,201 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 22,162 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Commercial lending | Construction and land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 40 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Commercial lending | Total CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 135,403 |  |  |
PCI Loans | Consumer lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 85,658 |  |  |
PCI Loans | Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 79,611 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Consumer lending | HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 6,047 |  |  |
Allowance for loan losses |  |  | 0 |  |  |
PCI Loans | Consumer lending | Total residential mortgage |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 85,658 |  |  |
PCI Loans | Consumer lending | Other consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment |  |  | 0 |  |  |
Allowance for loan losses |  |  | $ 0 |  |  |

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