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Loans Receivable and Allowance for Credit Losses (Loans Held-for-Sale Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale [1]   $ 613,088 $ 819,100 $ 1,747,621
Loans transferred from held-for-sale to held-for-investment   0 (4,943) (53,376)
Securitization of loans held-for-investment     201,675  
Sales   577,964 628,669 1,702,197
Purchases   534,730 1,141,028 282,407
Gross charge-offs   (473) (1,900) (5,100)
Held-to-maturity investment security   0 143,971  
Gain (loss) on sale of loans and leases   8,900 10,600 27,800
Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   534,956    
Lower of cost or fair value adjustment   61 5,600 3,000
Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   78,132    
Commercial And Industrial, Commercial Real Estate, And Single-Family Residential Loans [Member] | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   178,200    
Multifamily Residential, Commercial And Industrial, And Commercial Real Estate [Member] | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales     369,600  
Single-family Residential, Commercial And Industrial [Member] | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales       1,040,000
Loans Sold in Secondary Market | Loans receivable, purchased        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   399,800 259,100 661,900
Residential | Residential loan | Multifamily | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Held-to-maturity investment security $ 160,100      
Gain (loss) on sale of loans and leases 1,100      
Servicing asset, amortized cost $ 641      
Residential | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Purchases     488,300  
Commercial Lending | C&I        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     434,137 779,854
Loans transferred from held-for-sale to held-for-investment     0 0
Securitization of loans held-for-investment     0  
Sales   476,644 434,137 779,682
Purchases   503,359 646,793 233,090
Commercial Lending | C&I | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   476,644    
Commercial Lending | C&I | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   17,590    
Commercial Lending | CRE        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     110,927 227
Loans transferred from held-for-sale to held-for-investment     0 0
Securitization of loans held-for-investment     0  
Sales   52,217 110,927 227
Purchases   0 0 0
Commercial Lending | CRE | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   52,217    
Commercial Lending | CRE | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   36,783    
Commercial Lending | Residential loan | Multifamily        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     269,791 0
Loans transferred from held-for-sale to held-for-investment     (4,943) 0
Securitization of loans held-for-investment     201,675  
Sales   531 61,268 0
Purchases   2,311 5,658 11,046
Commercial Lending | Residential loan | Multifamily | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   531    
Commercial Lending | Residential loan | Multifamily | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   12,448    
Commercial Lending | Construction and land        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     4,245 4,754
Loans transferred from held-for-sale to held-for-investment     0 0
Securitization of loans held-for-investment     0  
Sales   1,609 4,245 4,754
Purchases   0 0 0
Commercial Lending | Construction and land | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   1,609    
Commercial Lending | Construction and land | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   241    
Consumer Lending | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     0 962,538
Loans transferred from held-for-sale to held-for-investment     0 (53,376)
Securitization of loans held-for-investment     0  
Sales   21,058 18,092 907,373
Purchases   29,060 488,577 38,271
Consumer Lending | Residential loan | Single-family | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   249    
Consumer Lending | Residential loan | Single-family | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   6,416    
Consumer Lending | HELOCs        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     0 248
Loans transferred from held-for-sale to held-for-investment     0 0
Securitization of loans held-for-investment     0  
Sales   0 0 248
Purchases   0 0 0
Consumer Lending | HELOCs | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   0    
Consumer Lending | HELOCs | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   4,309    
Consumer Lending | Other consumer        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     0 0
Loans transferred from held-for-sale to held-for-investment     0 0
Securitization of loans held-for-investment     0  
Sales   25,905 0 9,913
Purchases   0 $ 0 $ 0
Consumer Lending | Other consumer | Loans held-for-sale        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   3,706    
Consumer Lending | Other consumer | Loans held-for-sale | Desert Community Bank        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   $ 345    
[1] December 31, 2017 amount includes loans transferred from held-for-investment to branch assets held-for-sale.