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Loans Receivable and Allowance for Credit Losses (Loans Held-for-Sale Activity) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale [1]   $ 481,593,000 $ 613,088,000 $ 819,100,000
Loans transferred from held-for-sale to held-for-investment   2,306,000 0 4,943,000
Sales   511,101,000 577,964,000 628,669,000
Securitization of loans held-for-investment       201,675,000
Purchases   596,937,000 534,730,000 1,141,028,000
Gross charge-offs, loans transferred from held-for-investment to held-for-sale   14,600,000 473,000 1,900,000
Gain (loss) on sale of loans and leases   6,600,000 8,900,000 10,600,000
C&I | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   309,700,000    
Commercial And Industrial, Commercial Real Estate, And Single-Family Residential Loans | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales     178,200,000  
Commercial And Industrial, Commercial Real Estate and Multi-Family Residential | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales       369,600,000
Loans Sold in Secondary Market | Loans receivable, purchased        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   201,400,000 399,800,000 259,100,000
Commercial Lending | C&I        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   413,844,000 476,644,000 434,137,000
Securitization of loans held-for-investment       0
Purchases   525,767,000 503,359,000 646,793,000
Commercial Lending | CRE        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   62,291,000 52,217,000 110,927,000
Securitization of loans held-for-investment       0
Purchases   0 0 0
Commercial Lending | Residential loan | Multifamily        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   0 531,000 61,268,000
Securitization of loans held-for-investment       201,675,000
Purchases   7,389,000 2,311,000 5,658,000
Commercial Lending | Construction and land        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   0 1,609,000 4,245,000
Securitization of loans held-for-investment       0
Purchases   0 0 0
Consumer Lending | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   34,966,000 21,058,000 18,092,000
Securitization of loans held-for-investment       0
Purchases   63,781,000 29,060,000 488,577,000
Consumer Lending | HELOCs        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   0 0 0
Securitization of loans held-for-investment       0
Purchases   0 0 0
Consumer Lending | Other consumer        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Sales   0 25,905,000 0
Securitization of loans held-for-investment       0
Purchases   0 0 0
Residential | Residential loan | Multifamily | Loans receivable, originated        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Gain (loss) on sale of loans and leases $ 1,100,000      
Servicing asset, amortized cost 641,000      
Held-to-maturity investment security $ 160,100,000      
Residential | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Purchases       488,300,000
Loans        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   481,593,000 534,956,000 819,100,000
Loans transferred from held-for-sale to held-for-investment   2,306,000   4,943,000
Lower of cost or fair value adjustment   0 61,000 5,600,000
Loans | Commercial Lending | C&I        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   404,321,000 476,644,000 434,137,000
Loans transferred from held-for-sale to held-for-investment   2,306,000   0
Loans | Commercial Lending | CRE        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   62,291,000 52,217,000 110,927,000
Loans transferred from held-for-sale to held-for-investment   0   0
Loans | Commercial Lending | Residential loan | Multifamily        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   0 531,000 269,791,000
Loans transferred from held-for-sale to held-for-investment   0   4,943,000
Loans | Commercial Lending | Construction and land        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   0 1,609,000 4,245,000
Loans transferred from held-for-sale to held-for-investment   0   0
Loans | Consumer Lending | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   14,981,000 249,000 0
Loans transferred from held-for-sale to held-for-investment   0   0
Loans | Consumer Lending | HELOCs        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   0 0 0
Loans transferred from held-for-sale to held-for-investment   0   0
Loans | Consumer Lending | Other consumer        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale   0 3,706,000 0
Loans transferred from held-for-sale to held-for-investment   $ 0   $ 0
Desert Community Bank | Loans        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     78,132,000  
Desert Community Bank | Loans | Commercial Lending | C&I        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     17,590,000  
Desert Community Bank | Loans | Commercial Lending | CRE        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     36,783,000  
Desert Community Bank | Loans | Commercial Lending | Residential loan | Multifamily        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     12,448,000  
Desert Community Bank | Loans | Commercial Lending | Construction and land        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     241,000  
Desert Community Bank | Loans | Consumer Lending | Residential loan | Single-family        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     6,416,000  
Desert Community Bank | Loans | Consumer Lending | HELOCs        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     4,309,000  
Desert Community Bank | Loans | Consumer Lending | Other consumer        
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES        
Loans transferred from held-for-investment to held-for-sale     $ 345,000  
[1] December 31, 2017 amount includes loans transferred from held-for-investment to branch assets held-for-sale.