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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for loan losses          
Allowance for loan losses $ 557,003   $ 358,287 $ 317,894  
Recorded investment in loans          
Loans held-for-investment 35,893,393   34,778,539    
Commercial and industrial (“C&I”)          
Allowance for loan losses          
Allowance for loan losses 416        
Commercial lending          
Recorded investment in loans          
Loans held-for-investment 26,781,816   25,914,252    
Commercial lending | Commercial and industrial (“C&I”)          
Allowance for loan losses          
Allowance for loan losses 362,629 $ 312,613 238,376    
Recorded investment in loans          
Loans held-for-investment 12,590,764   12,150,931    
Commercial lending | Commercial real estate (“CRE”)          
Allowance for loan losses          
Allowance for loan losses 132,819 112,678 40,509    
Recorded investment in loans          
Loans held-for-investment 10,682,242   10,278,448    
Commercial lending | Real estate loan | Multifamily residential          
Allowance for loan losses          
Allowance for loan losses 16,530 14,714 22,826    
Recorded investment in loans          
Loans held-for-investment 2,902,601   2,856,374    
Commercial lending | Construction and land          
Allowance for loan losses          
Allowance for loan losses 11,018 9,515 19,404    
Recorded investment in loans          
Loans held-for-investment 606,209   628,499    
Consumer lending          
Recorded investment in loans          
Loans held-for-investment 9,111,577   8,864,287    
Consumer lending | Real estate loan | Single-family residential          
Allowance for loan losses          
Allowance for loan losses 26,822 24,857 28,527    
Recorded investment in loans          
Loans held-for-investment 7,403,723   7,108,590    
Consumer lending | HELOCs          
Allowance for loan losses          
Allowance for loan losses 3,881 3,467 5,265    
Recorded investment in loans          
Loans held-for-investment 1,452,862   1,472,783    
Consumer lending | Other consumer          
Allowance for loan losses          
Allowance for loan losses 3,304 $ 5,601 3,380    
Recorded investment in loans          
Loans held-for-investment $ 254,992   282,914    
Non-PCI Loans          
Allowance for loan losses          
Individually evaluated for impairment     5,593    
Collectively evaluated for impairment     352,694    
Allowance for loan losses     358,287 317,880 $ 311,300
Recorded investment in loans          
Individually evaluated for impairment     198,117    
Collectively evaluated for impairment     34,357,551    
Loans held-for-investment     34,555,668    
Non-PCI Loans | Commercial lending          
Allowance for loan losses          
Individually evaluated for impairment     3,033    
Recorded investment in loans          
Loans held-for-investment     25,777,039    
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)          
Allowance for loan losses          
Individually evaluated for impairment     2,881    
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    
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)          
Allowance for loan losses          
Individually evaluated for impairment     97    
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    
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential          
Allowance for loan losses          
Individually evaluated for impairment     55    
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    
Non-PCI Loans | Commercial lending | Construction and land          
Allowance for loan losses          
Individually evaluated for impairment     0    
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    
Non-PCI Loans | Consumer lending          
Allowance for loan losses          
Individually evaluated for impairment     2,560    
Recorded investment in loans          
Loans held-for-investment     8,778,629    
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential          
Allowance for loan losses          
Individually evaluated for impairment     35    
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    
Non-PCI Loans | Consumer lending | HELOCs          
Allowance for loan losses          
Individually evaluated for impairment     8    
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    
Non-PCI Loans | Consumer lending | Other consumer          
Allowance for loan losses          
Individually evaluated for impairment     2,517    
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    
PCI Loans          
Allowance for loan losses          
Allowance for loan losses     0 $ 14 $ 22
Recorded investment in loans          
Loans held-for-investment     222,871    
PCI Loans | Commercial lending          
Recorded investment in loans          
Loans held-for-investment     137,213    
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     1,810    
PCI Loans | Commercial lending | Commercial real estate (“CRE”)          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     113,201    
PCI Loans | Commercial lending | Real estate loan | Multifamily residential          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     22,162    
PCI Loans | Commercial lending | Construction and land          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     40    
PCI Loans | Consumer lending          
Recorded investment in loans          
Loans held-for-investment     85,658    
PCI Loans | Consumer lending | Real estate loan | Single-family residential          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     79,611    
PCI Loans | Consumer lending | HELOCs          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     6,047    
PCI Loans | Consumer lending | Other consumer          
Allowance for loan losses          
Allowance for loan losses     0    
Recorded investment in loans          
Loans held-for-investment     $ 0