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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for loan losses        
Allowance for loan losses $ 358,287 $ 311,322 $ 287,128  
Recorded investment in loans        
Loans held-for-investment 34,778,539 32,385,189    
Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 5,593 4,032    
Allowance for loan losses        
Collectively evaluated for impairment 352,694 307,268    
Allowance for loan losses 358,287 311,300 287,070 $ 260,402
Recorded investment in loans        
Individually evaluated for impairment 198,117 118,918    
Collectively evaluated for impairment 34,357,551 31,958,248    
Loans held-for-investment 34,555,668 32,077,166    
Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 22 $ 58 $ 118
Recorded investment in loans        
Loans held-for-investment 222,871 308,023    
Commercial Lending        
Recorded investment in loans        
Loans held-for-investment 25,914,252 24,326,631    
Commercial Lending | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 3,033 1,502    
Recorded investment in loans        
Loans held-for-investment 25,777,039 24,124,659    
Commercial Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment 137,213 201,972    
Commercial Lending | C&I        
Allowance for loan losses        
Allowance for loan losses 238,376 189,117    
Recorded investment in loans        
Loans held-for-investment 12,150,931 12,056,970    
Commercial Lending | C&I | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 2,881 1,219    
Allowance for loan losses        
Collectively evaluated for impairment 235,495 187,898    
Recorded investment in loans        
Individually evaluated for impairment 114,042 57,088    
Collectively evaluated for impairment 12,035,079 11,997,730    
Loans held-for-investment 12,149,121 12,054,818    
Commercial Lending | C&I | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment 1,810 2,152    
Commercial Lending | CRE        
Allowance for loan losses        
Allowance for loan losses 40,509 40,666    
Recorded investment in loans        
Loans held-for-investment 10,278,448 9,260,199    
Commercial Lending | CRE | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 97 208    
Allowance for loan losses        
Collectively evaluated for impairment 40,412 40,436    
Recorded investment in loans        
Individually evaluated for impairment 21,618 30,352    
Collectively evaluated for impairment 10,143,629 9,066,813    
Loans held-for-investment 10,165,247 9,097,165    
Commercial Lending | CRE | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 22    
Recorded investment in loans        
Loans held-for-investment 113,201 163,034    
Commercial Lending | Residential loan | Multifamily        
Allowance for loan losses        
Allowance for loan losses 22,826 19,885    
Recorded investment in loans        
Loans held-for-investment 2,856,374 2,470,668    
Commercial Lending | Residential loan | Multifamily | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 55 75    
Allowance for loan losses        
Collectively evaluated for impairment 22,771 19,810    
Recorded investment in loans        
Individually evaluated for impairment 4,464 5,560    
Collectively evaluated for impairment 2,829,748 2,428,364    
Loans held-for-investment 2,834,212 2,433,924    
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment 22,162 36,744    
Commercial Lending | Construction and land        
Allowance for loan losses        
Allowance for loan losses 19,404 20,290    
Recorded investment in loans        
Loans held-for-investment 628,499 538,794    
Commercial Lending | Construction and land | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 0 0    
Allowance for loan losses        
Collectively evaluated for impairment 19,404 20,290    
Recorded investment in loans        
Individually evaluated for impairment 19,691 0    
Collectively evaluated for impairment 608,768 538,752    
Loans held-for-investment 628,459 538,752    
Commercial Lending | Construction and land | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment 40 42    
Consumer Lending        
Recorded investment in loans        
Loans held-for-investment 8,864,287 8,058,558    
Consumer Lending | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 2,560 2,530    
Recorded investment in loans        
Loans held-for-investment 8,778,629 7,952,507    
Consumer Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Loans held-for-investment 85,658 106,051    
Consumer Lending | Residential loan | Single-family        
Allowance for loan losses        
Allowance for loan losses 28,527 31,340    
Recorded investment in loans        
Loans held-for-investment 7,108,590 6,036,454    
Consumer Lending | Residential loan | Single-family | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 35 34    
Allowance for loan losses        
Collectively evaluated for impairment 28,492 31,306    
Recorded investment in loans        
Individually evaluated for impairment 22,211 13,460    
Collectively evaluated for impairment 7,006,768 5,925,798    
Loans held-for-investment 7,028,979 5,939,258    
Consumer Lending | Residential loan | Single-family | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment 79,611 97,196    
Consumer Lending | HELOCs        
Allowance for loan losses        
Allowance for loan losses 5,265 5,774    
Recorded investment in loans        
Loans held-for-investment 1,472,783 1,690,834    
Consumer Lending | HELOCs | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 8 5    
Allowance for loan losses        
Collectively evaluated for impairment 5,257 5,769    
Recorded investment in loans        
Individually evaluated for impairment 13,574 9,956    
Collectively evaluated for impairment 1,453,162 1,672,023    
Loans held-for-investment 1,466,736 1,681,979    
Consumer Lending | HELOCs | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment 6,047 8,855    
Consumer Lending | Other consumer        
Allowance for loan losses        
Allowance for loan losses 3,380 4,250    
Recorded investment in loans        
Loans held-for-investment 282,914 331,270    
Consumer Lending | Other consumer | Non-PCI loans        
Financing Receivable, Allowance for Credit Losses        
Related Allowance 2,517 2,491    
Allowance for loan losses        
Collectively evaluated for impairment 863 1,759    
Recorded investment in loans        
Individually evaluated for impairment 2,517 2,502    
Collectively evaluated for impairment 280,397 328,768    
Loans held-for-investment 282,914 331,270    
Consumer Lending | Other consumer | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Loans held-for-investment $ 0 $ 0