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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for loan losses        
Allowance for loan losses $ 619,983 $ 358,287 $ 311,322 $ 287,128
Recorded investment in loans        
Loans held-for-investment 38,390,955 34,778,539    
Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   5,593    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   352,694    
Allowance for loan losses   358,287    
Recorded investment in loans        
Individually evaluated for impairment   198,117    
Collectively evaluated for impairment   34,357,551    
Loans held-for-investment   34,555,668    
Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses   0    
Recorded investment in loans        
Loans held-for-investment   222,871    
Commercial Lending        
Recorded investment in loans        
Loans held-for-investment 28,440,027 25,914,252    
Commercial Lending | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   3,033    
Recorded investment in loans        
Loans held-for-investment   25,777,039    
Commercial Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   137,213    
Commercial Lending | C&I        
Allowance for loan losses        
Allowance for loan losses 398,040 238,376 189,117 163,058
Recorded investment in loans        
Loans held-for-investment 13,631,726 12,150,931    
Commercial Lending | C&I | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   2,881    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   235,495    
Recorded investment in loans        
Individually evaluated for impairment   114,042    
Collectively evaluated for impairment   12,035,079    
Loans held-for-investment   12,149,121    
Commercial Lending | C&I | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   1,810    
Commercial Lending | CRE        
Allowance for loan losses        
Allowance for loan losses 163,791 40,509 40,666 40,809
Recorded investment in loans        
Loans held-for-investment 11,174,611 10,278,448    
Commercial Lending | CRE | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   97    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   40,412    
Recorded investment in loans        
Individually evaluated for impairment   21,618    
Collectively evaluated for impairment   10,143,629    
Loans held-for-investment   10,165,247    
Commercial Lending | CRE | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   113,201    
Commercial Lending | Residential loan | Multifamily        
Allowance for loan losses        
Allowance for loan losses 27,573 22,826 19,885 19,537
Recorded investment in loans        
Loans held-for-investment 3,033,998 2,856,374    
Commercial Lending | Residential loan | Multifamily | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   55    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   22,771    
Recorded investment in loans        
Individually evaluated for impairment   4,464    
Collectively evaluated for impairment   2,829,748    
Loans held-for-investment   2,834,212    
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   22,162    
Commercial Lending | Construction and land        
Allowance for loan losses        
Allowance for loan losses 10,239 19,404 20,290 26,881
Recorded investment in loans        
Loans held-for-investment 599,692 628,499    
Commercial Lending | Construction and land | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   0    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   19,404    
Recorded investment in loans        
Individually evaluated for impairment   19,691    
Collectively evaluated for impairment   608,768    
Loans held-for-investment   628,459    
Commercial Lending | Construction and land | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   40    
Consumer Lending        
Recorded investment in loans        
Loans held-for-investment 9,950,928 8,864,287    
Consumer Lending | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   2,560    
Recorded investment in loans        
Loans held-for-investment   8,778,629    
Consumer Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   85,658    
Consumer Lending | Residential loan | Single-family        
Allowance for loan losses        
Allowance for loan losses 15,520 28,527 31,340 26,362
Recorded investment in loans        
Loans held-for-investment 8,185,953 7,108,590    
Consumer Lending | Residential loan | Single-family | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   35    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   28,492    
Recorded investment in loans        
Individually evaluated for impairment   22,211    
Collectively evaluated for impairment   7,006,768    
Loans held-for-investment   7,028,979    
Consumer Lending | Residential loan | Single-family | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   79,611    
Consumer Lending | HELOCs        
Allowance for loan losses        
Allowance for loan losses 2,690 5,265 5,774 7,354
Recorded investment in loans        
Loans held-for-investment 1,601,716 1,472,783    
Consumer Lending | HELOCs | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   8    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   5,257    
Recorded investment in loans        
Individually evaluated for impairment   13,574    
Collectively evaluated for impairment   1,453,162    
Loans held-for-investment   1,466,736    
Consumer Lending | HELOCs | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   6,047    
Consumer Lending | Other consumer        
Allowance for loan losses        
Allowance for loan losses 2,130 3,380 $ 4,250 $ 3,127
Recorded investment in loans        
Loans held-for-investment $ 163,259 282,914    
Consumer Lending | Other consumer | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance   2,517    
Allowance for loan losses        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment   863    
Recorded investment in loans        
Individually evaluated for impairment   2,517    
Collectively evaluated for impairment   280,397    
Loans held-for-investment   282,914    
Consumer Lending | Other consumer | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment   $ 0