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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses        
Loans held-for-investment $ 287,128 $ 260,520 $ 264,959  
Recorded investment in loans        
Financing receivables, gross 28,975,718 25,503,139    
Total loans held-for-investment 28,975,718 25,503,139    
Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 19,895 12,701    
Collectively evaluated for impairment 267,175 247,701    
Loans held-for-investment 287,070 260,402 264,600 $ 260,965
Recorded investment in loans        
Individually evaluated for impairment 170,887 206,055    
Collectively evaluated for impairment 28,322,544 24,654,639    
Financing receivables, gross 28,493,431 24,860,694    
Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 58 118 $ 359 $ 714
Recorded investment in loans        
Financing receivables, gross 482,287 642,445    
Commercial Lending        
Recorded investment in loans        
Financing receivables, gross 22,210,001 19,917,365    
Commercial Lending | Non-PCI impaired loans        
Recorded investment in loans        
Financing receivables, gross 21,859,099 19,432,958    
Commercial Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Financing receivables, gross 350,902 484,407    
Commercial Lending | C&I        
Allowance for loan losses        
Loans held-for-investment 163,058 142,167    
Recorded investment in loans        
Financing receivables, gross 10,697,231 9,640,563    
Total loans held-for-investment 10,697,231 9,640,563    
Commercial Lending | C&I | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 16,094 10,477    
Collectively evaluated for impairment 146,964 131,689    
Recorded investment in loans        
Individually evaluated for impairment 98,685 125,619    
Collectively evaluated for impairment 10,586,751 9,476,557    
Financing receivables, gross 10,685,436 9,602,176    
Commercial Lending | C&I | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 1    
Recorded investment in loans        
Financing receivables, gross 11,795 38,387    
Commercial Lending | CRE        
Allowance for loan losses        
Loans held-for-investment 41,237 47,927    
Recorded investment in loans        
Financing receivables, gross 8,936,897 8,016,109    
Total loans held-for-investment 8,936,897 8,016,109    
Commercial Lending | CRE | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 684 1,263    
Collectively evaluated for impairment 40,495 46,552    
Recorded investment in loans        
Individually evaluated for impairment 35,556 46,508    
Collectively evaluated for impairment 8,623,653 7,621,153    
Financing receivables, gross 8,659,209 7,667,661    
Commercial Lending | CRE | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 58 112    
Recorded investment in loans        
Financing receivables, gross 277,688 348,448    
Commercial Lending | Residential loan | Multifamily        
Allowance for loan losses        
Loans held-for-investment 19,109 17,543    
Recorded investment in loans        
Financing receivables, gross 1,916,176 1,585,939    
Total loans held-for-investment 1,916,176 1,585,939    
Commercial Lending | Residential loan | Multifamily | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 88 180    
Collectively evaluated for impairment 19,021 17,363    
Recorded investment in loans        
Individually evaluated for impairment 10,636 10,041    
Collectively evaluated for impairment 1,844,492 1,480,244    
Financing receivables, gross 1,855,128 1,490,285    
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 0    
Recorded investment in loans        
Financing receivables, gross 61,048 95,654    
Commercial Lending | Construction and land        
Allowance for loan losses        
Loans held-for-investment 26,881 24,989    
Recorded investment in loans        
Financing receivables, gross 659,697 674,754    
Total loans held-for-investment 659,697 674,754    
Commercial Lending | Construction and land | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 0 63    
Collectively evaluated for impairment 26,881 24,926    
Recorded investment in loans        
Individually evaluated for impairment 3,973 5,870    
Collectively evaluated for impairment 655,353 666,966    
Financing receivables, gross 659,326 672,836    
Commercial Lending | Construction and land | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 0    
Recorded investment in loans        
Financing receivables, gross 371 1,918    
Consumer Lending        
Recorded investment in loans        
Financing receivables, gross 6,765,717 5,585,774    
Consumer Lending | Non-PCI impaired loans        
Recorded investment in loans        
Financing receivables, gross 6,634,332 5,427,736    
Consumer Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Financing receivables, gross 131,385 158,038    
Consumer Lending | Residential loan | Single-family        
Allowance for loan losses        
Loans held-for-investment 26,362 19,795    
Recorded investment in loans        
Financing receivables, gross 4,646,289 3,509,779    
Total loans held-for-investment 4,646,289 3,509,779    
Consumer Lending | Residential loan | Single-family | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 534 687    
Collectively evaluated for impairment 25,828 19,103    
Recorded investment in loans        
Individually evaluated for impairment 14,338 14,335    
Collectively evaluated for impairment 4,514,573 3,356,334    
Financing receivables, gross 4,528,911 3,370,669    
Consumer Lending | Residential loan | Single-family | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 5    
Recorded investment in loans        
Financing receivables, gross 117,378 139,110    
Consumer Lending | HELOCs        
Allowance for loan losses        
Loans held-for-investment 7,354 7,506    
Recorded investment in loans        
Financing receivables, gross 1,782,924 1,760,776    
Total loans held-for-investment 1,782,924 1,760,776    
Consumer Lending | HELOCs | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 4 31    
Collectively evaluated for impairment 7,350 7,475    
Recorded investment in loans        
Individually evaluated for impairment 5,208 3,682    
Collectively evaluated for impairment 1,763,709 1,738,170    
Financing receivables, gross 1,768,917 1,741,852    
Consumer Lending | HELOCs | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 0    
Recorded investment in loans        
Financing receivables, gross 14,007 18,924    
Consumer Lending | Other consumer        
Allowance for loan losses        
Loans held-for-investment 3,127 593    
Recorded investment in loans        
Financing receivables, gross 336,504 315,219    
Total loans held-for-investment 336,504 315,219    
Consumer Lending | Other consumer | Non-PCI impaired loans        
Allowance for loan losses        
Individually evaluated for impairment 2,491 0    
Collectively evaluated for impairment 636 593    
Recorded investment in loans        
Individually evaluated for impairment 2,491 0    
Collectively evaluated for impairment 334,013 315,215    
Financing receivables, gross 336,504 315,215    
Consumer Lending | Other consumer | Acquired with deteriorated credit quality        
Allowance for loan losses        
Loans held-for-investment 0 0    
Recorded investment in loans        
Financing receivables, gross $ 0 $ 4