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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan losses        
Allowance for loan losses $ 311,322 $ 287,128 $ 260,520  
Recorded investment in loans        
Financing receivables, gross 32,385,189 28,975,718    
Total allowance for loan losses 32,385,189 28,975,718    
Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 4,032 19,895    
Collectively evaluated for impairment 307,268 267,175    
Allowance for loan losses 311,300 287,070 260,402 $ 264,600
Recorded investment in loans        
Individually evaluated for impairment 118,918 170,887    
Collectively evaluated for impairment 31,958,248 28,322,544    
Financing receivables, gross 32,077,166 28,493,431    
Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 22 58 $ 118 $ 359
Recorded investment in loans        
Financing receivables, gross 308,023 482,287    
Commercial Lending        
Recorded investment in loans        
Financing receivables, gross 24,326,631 22,210,001    
Commercial Lending | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 1,502 16,866    
Recorded investment in loans        
Financing receivables, gross 24,124,659 21,859,099    
Commercial Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Financing receivables, gross 201,972 350,902    
Commercial Lending | C&I        
Allowance for loan losses        
Allowance for loan losses 191,340 163,058    
Recorded investment in loans        
Financing receivables, gross 12,056,970 10,697,231    
Total allowance for loan losses 12,056,970 10,697,231    
Commercial Lending | C&I | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 1,219 16,094    
Collectively evaluated for impairment 190,121 146,964    
Recorded investment in loans        
Individually evaluated for impairment 57,088 98,685    
Collectively evaluated for impairment 11,997,730 10,586,751    
Financing receivables, gross 12,054,818 10,685,436    
Commercial Lending | C&I | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Financing receivables, gross 2,152 11,795    
Commercial Lending | CRE        
Allowance for loan losses        
Allowance for loan losses 39,053 41,237    
Recorded investment in loans        
Financing receivables, gross 9,449,835 8,936,897    
Total allowance for loan losses 9,449,835 8,936,897    
Commercial Lending | CRE | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 208 684    
Collectively evaluated for impairment 38,823 40,495    
Recorded investment in loans        
Individually evaluated for impairment 30,352 35,556    
Collectively evaluated for impairment 9,254,231 8,623,653    
Financing receivables, gross 9,284,583 8,659,209    
Commercial Lending | CRE | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 22 58    
Recorded investment in loans        
Financing receivables, gross 165,252 277,688    
Commercial Lending | Residential loan | Multifamily        
Allowance for loan losses        
Allowance for loan losses 19,283 19,109    
Recorded investment in loans        
Financing receivables, gross 2,281,032 1,916,176    
Total allowance for loan losses 2,281,032 1,916,176    
Commercial Lending | Residential loan | Multifamily | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 75 88    
Collectively evaluated for impairment 19,208 19,021    
Recorded investment in loans        
Individually evaluated for impairment 5,560 10,636    
Collectively evaluated for impairment 2,240,946 1,844,492    
Financing receivables, gross 2,246,506 1,855,128    
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Financing receivables, gross 34,526 61,048    
Commercial Lending | Construction and land        
Allowance for loan losses        
Allowance for loan losses 20,282 26,881    
Recorded investment in loans        
Financing receivables, gross 538,794 659,697    
Total allowance for loan losses 538,794 659,697    
Commercial Lending | Construction and land | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 0 0    
Collectively evaluated for impairment 20,282 26,881    
Recorded investment in loans        
Individually evaluated for impairment 0 3,973    
Collectively evaluated for impairment 538,752 655,353    
Financing receivables, gross 538,752 659,326    
Commercial Lending | Construction and land | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Financing receivables, gross 42 371    
Consumer Lending        
Recorded investment in loans        
Financing receivables, gross 8,058,558 6,765,717    
Consumer Lending | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 2,530 3,029    
Recorded investment in loans        
Financing receivables, gross 7,952,507 6,634,332    
Consumer Lending | Acquired with deteriorated credit quality        
Recorded investment in loans        
Financing receivables, gross 106,051 131,385    
Consumer Lending | Residential loan | Single-family        
Allowance for loan losses        
Allowance for loan losses 31,340 26,362    
Recorded investment in loans        
Financing receivables, gross 6,036,454 4,646,289    
Total allowance for loan losses 6,036,454 4,646,289    
Consumer Lending | Residential loan | Single-family | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 34 534    
Collectively evaluated for impairment 31,306 25,828    
Recorded investment in loans        
Individually evaluated for impairment 13,460 14,338    
Collectively evaluated for impairment 5,925,798 4,514,573    
Financing receivables, gross 5,939,258 4,528,911    
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        
Financing receivables, gross 97,196 117,378    
Consumer Lending | HELOCs        
Allowance for loan losses        
Allowance for loan losses 5,774 7,354    
Recorded investment in loans        
Financing receivables, gross 1,690,834 1,782,924    
Total allowance for loan losses 1,690,834 1,782,924    
Consumer Lending | HELOCs | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 5 4    
Collectively evaluated for impairment 5,769 7,350    
Recorded investment in loans        
Individually evaluated for impairment 9,956 5,208    
Collectively evaluated for impairment 1,672,023 1,763,709    
Financing receivables, gross 1,681,979 1,768,917    
Consumer Lending | HELOCs | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Financing receivables, gross 8,855 14,007    
Consumer Lending | Other consumer        
Allowance for loan losses        
Allowance for loan losses 4,250 3,127    
Recorded investment in loans        
Financing receivables, gross 331,270 336,504    
Total allowance for loan losses 331,270 336,504    
Consumer Lending | Other consumer | Non-PCI loans        
Allowance for loan losses        
Individually evaluated for impairment 2,491 2,491    
Collectively evaluated for impairment 1,759 636    
Recorded investment in loans        
Individually evaluated for impairment 2,502 2,491    
Collectively evaluated for impairment 328,768 334,013    
Financing receivables, gross 331,270 336,504    
Consumer Lending | Other consumer | Acquired with deteriorated credit quality        
Allowance for loan losses        
Allowance for loan losses 0 0    
Recorded investment in loans        
Financing receivables, gross $ 0 $ 0