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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Allowance for loan losses            
Allowance for loan losses $ 301,550   $ 287,128 $ 276,316    
Recorded investment in loans            
Loans held-for-investment 30,230,379   28,975,718      
Commercial lending            
Recorded investment in loans            
Loans held-for-investment 22,769,945   22,210,001      
Commercial lending | Commercial and industrial (“C&I”)            
Allowance for loan losses            
Allowance for loan losses 162,404   163,058      
Recorded investment in loans            
Loans held-for-investment 11,059,019   10,697,231      
Commercial lending | Commercial real estate (“CRE”)            
Allowance for loan losses            
Allowance for loan losses 44,620   41,237      
Recorded investment in loans            
Loans held-for-investment 9,054,567   8,936,897      
Commercial lending | Real estate loan | Multifamily            
Allowance for loan losses            
Allowance for loan losses 18,486   19,109      
Recorded investment in loans            
Loans held-for-investment 2,032,522   1,916,176      
Commercial lending | Construction and land            
Allowance for loan losses            
Allowance for loan losses 30,362   26,881      
Recorded investment in loans            
Loans held-for-investment 623,837   659,697      
Consumer lending            
Recorded investment in loans            
Loans held-for-investment 7,460,434   6,765,717      
Consumer lending | Real estate loan | Single-family            
Allowance for loan losses            
Allowance for loan losses 33,388   26,362      
Recorded investment in loans            
Loans held-for-investment 5,316,895   4,646,289      
Consumer lending | HELOCs            
Allowance for loan losses            
Allowance for loan losses 7,277   7,354      
Recorded investment in loans            
Loans held-for-investment 1,769,511   1,782,924      
Consumer lending | Other consumer            
Allowance for loan losses            
Allowance for loan losses 5,013   3,127      
Recorded investment in loans            
Loans held-for-investment 374,028   336,504      
Non-PCI Loans            
Allowance for loan losses            
Individually evaluated for impairment 14,161   19,895      
Collectively evaluated for impairment 287,350   267,175      
Allowance for loan losses 301,511 $ 297,607 287,070 276,238 $ 263,007 $ 260,402
Recorded investment in loans            
Individually evaluated for impairment 129,791   170,887      
Collectively evaluated for impairment 29,716,903   28,322,544      
Loans held-for-investment 29,846,694   28,493,431      
Non-PCI Loans | Commercial lending            
Recorded investment in loans            
Loans held-for-investment 22,504,559   21,859,099      
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)            
Allowance for loan losses            
Individually evaluated for impairment 10,920   16,094      
Collectively evaluated for impairment 151,484   146,964      
Recorded investment in loans            
Individually evaluated for impairment 63,654   98,685      
Collectively evaluated for impairment 10,992,571   10,586,751      
Loans held-for-investment 11,056,225   10,685,436      
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)            
Allowance for loan losses            
Individually evaluated for impairment 520   684      
Collectively evaluated for impairment 44,061   40,495      
Recorded investment in loans            
Individually evaluated for impairment 32,146   35,556      
Collectively evaluated for impairment 8,803,930   8,623,653      
Loans held-for-investment 8,836,076   8,659,209      
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily            
Allowance for loan losses            
Individually evaluated for impairment 99   88      
Collectively evaluated for impairment 18,387   19,021      
Recorded investment in loans            
Individually evaluated for impairment 6,102   10,636      
Collectively evaluated for impairment 1,982,362   1,844,492      
Loans held-for-investment 1,988,464   1,855,128      
Non-PCI Loans | Commercial lending | Construction and land            
Allowance for loan losses            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 30,362   26,881      
Recorded investment in loans            
Individually evaluated for impairment 0   3,973      
Collectively evaluated for impairment 623,794   655,353      
Loans held-for-investment 623,794   659,326      
Non-PCI Loans | Consumer lending            
Recorded investment in loans            
Loans held-for-investment 7,342,135   6,634,332      
Non-PCI Loans | Consumer lending | Real estate loan | Single-family            
Allowance for loan losses            
Individually evaluated for impairment 53   534      
Collectively evaluated for impairment 33,335   25,828      
Recorded investment in loans            
Individually evaluated for impairment 15,916   14,338      
Collectively evaluated for impairment 5,194,098   4,514,573      
Loans held-for-investment 5,210,014   4,528,911      
Non-PCI Loans | Consumer lending | HELOCs            
Allowance for loan losses            
Individually evaluated for impairment 78   4      
Collectively evaluated for impairment 7,199   7,350      
Recorded investment in loans            
Individually evaluated for impairment 9,482   5,208      
Collectively evaluated for impairment 1,748,611   1,763,709      
Loans held-for-investment 1,758,093   1,768,917      
Non-PCI Loans | Consumer lending | Other consumer            
Allowance for loan losses            
Individually evaluated for impairment 2,491   2,491      
Collectively evaluated for impairment 2,522   636      
Recorded investment in loans            
Individually evaluated for impairment 2,491   2,491      
Collectively evaluated for impairment 371,537   334,013      
Loans held-for-investment 374,028   336,504      
Acquired with deteriorated credit quality            
Allowance for loan losses            
Allowance for loan losses 39 $ 47 58 $ 78 $ 87 $ 118
Recorded investment in loans            
Loans held-for-investment 383,685   482,287      
Acquired with deteriorated credit quality | Commercial lending            
Recorded investment in loans            
Loans held-for-investment 265,386   350,902      
Acquired with deteriorated credit quality | Commercial lending | Commercial and industrial (“C&I”)            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment 2,794   11,795      
Acquired with deteriorated credit quality | Commercial lending | Commercial real estate (“CRE”)            
Allowance for loan losses            
Allowance for loan losses 39   58      
Recorded investment in loans            
Loans held-for-investment 218,491   277,688      
Acquired with deteriorated credit quality | Commercial lending | Real estate loan | Multifamily            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment 44,058   61,048      
Acquired with deteriorated credit quality | Commercial lending | Construction and land            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment 43   371      
Acquired with deteriorated credit quality | Consumer lending            
Recorded investment in loans            
Loans held-for-investment 118,299   131,385      
Acquired with deteriorated credit quality | Consumer lending | Real estate loan | Single-family            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment 106,881   117,378      
Acquired with deteriorated credit quality | Consumer lending | HELOCs            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment 11,418   14,007      
Acquired with deteriorated credit quality | Consumer lending | Other consumer            
Allowance for loan losses            
Allowance for loan losses 0   0      
Recorded investment in loans            
Loans held-for-investment $ 0   $ 0