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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment $ 35,893,393   $ 34,778,539    
Allowance for loan losses (557,003)   (358,287) $ (317,894)  
Loans held-for-investment, net 35,336,390   34,420,252    
Commercial and industrial (“C&I”)          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Allowance for loan losses (416)        
Commercial lending          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 26,781,816   25,914,252    
Commercial lending | Commercial and industrial (“C&I”)          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 12,590,764   12,150,931    
Allowance for loan losses (362,629) $ (312,613) (238,376)    
Commercial lending | Commercial real estate (“CRE”)          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 10,682,242   10,278,448    
Allowance for loan losses (132,819) (112,678) (40,509)    
Commercial lending | Real estate loan | Multifamily residential          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 2,902,601   2,856,374    
Allowance for loan losses (16,530) (14,714) (22,826)    
Commercial lending | Construction and land          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 606,209   628,499    
Allowance for loan losses (11,018) (9,515) (19,404)    
Commercial lending | Total CRE          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 14,191,052   13,763,321    
Consumer lending          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 9,111,577   8,864,287    
Consumer lending | Real estate loan | Single-family residential          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 7,403,723   7,108,590    
Allowance for loan losses (26,822) (24,857) (28,527)    
Consumer lending | HELOCs          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 1,452,862   1,472,783    
Allowance for loan losses (3,881) (3,467) (5,265)    
Consumer lending | Total residential mortgage          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 8,856,585   8,581,373    
Consumer lending | Other consumer          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment 254,992   282,914    
Allowance for loan losses (3,304) $ (5,601) (3,380)    
Non-PCI Loans          
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES          
Loans held-for-investment     34,555,668    
Allowance for loan losses     (358,287) (317,880) $ (311,300)
Loans held-for-investment, net     34,197,381    
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts $ (50,300)   (43,200)    
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 $ (14) $ (22)
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