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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | $ 40,481,705 |  | $ 38,390,955 |  |  |
Allowance for loan losses | (560,404) | $ (585,724) | (619,983) | $ (618,252) | $ (632,071) | $ (358,287)
Loans held-for-investment, net | 39,921,301 |  | 37,770,972 |  |  |
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts | (54,300) |  | (58,800) |  |  |
CARES Act, Paycheck Protection Program |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Net origination fees | (13,500) |  | (12,700) |  |  |
Commercial and industrial (“C&I”) | CARES Act, Paycheck Protection Program |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 807,300 |  | 1,570,000 |  |  |
Commercial lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 29,367,013 |  | 28,440,027 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 13,831,649 |  | 13,631,726 |  |  |
Allowance for loan losses | (342,142) | (362,528) | (398,040) | (389,021) | (380,723) | (238,376)
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 11,818,065 |  | 11,174,611 |  |  |
Allowance for loan losses | (150,049) | (161,962) | (163,791) | (166,810) | (176,040) | (40,509)
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 3,340,378 |  | 3,033,998 |  |  |
Allowance for loan losses | (19,917) | (21,925) | (27,573) | (23,807) | (25,058) | (22,826)
Commercial lending | Construction and land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 376,921 |  | 599,692 |  |  |
Allowance for loan losses | (22,294) | (15,643) | (10,239) | (10,401) | (18,551) | (19,404)
Commercial lending | Total CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 15,535,364 |  | 14,808,301 |  |  |
Consumer lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 11,114,692 |  | 9,950,928 |  |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 9,021,801 |  | 8,185,953 |  |  |
Allowance for loan losses | (18,292) | (16,530) | (15,520) | (22,622) | (25,314) | (28,527)
Consumer lending | HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 1,963,622 |  | 1,601,716 |  |  |
Allowance for loan losses | (3,392) | (2,938) | (2,690) | (3,273) | (3,867) | (5,265)
Consumer lending | Total residential mortgage |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 10,985,423 |  | 9,787,669 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 129,269 |  | 163,259 |  |  |
Allowance for loan losses | $ (4,318) | $ (4,198) | $ (2,130) | $ (2,318) | $ (2,518) | $ (3,380)

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