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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | $ 330,625 |  | $ 311,322 | $ 301,550 |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 33,730,377 |  | 32,385,189 |  |  |
Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 25,318,543 |  | 24,326,631 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 205,503 |  | 191,340 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 12,402,967 |  | 12,056,970 |  |  |
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 40,517 |  | 39,053 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 9,868,433 |  | 9,449,835 |  |  |
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 18,574 |  | 19,283 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 2,372,345 |  | 2,281,032 |  |  |
Commercial lending | Construction and land |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 22,961 |  | 20,282 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 674,798 |  | 538,794 |  |  |
Consumer lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 8,411,834 |  | 8,058,558 |  |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 32,763 |  | 31,340 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 6,494,882 |  | 6,036,454 |  |  |
Consumer lending | HELOCs |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 6,177 |  | 5,774 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 1,575,150 |  | 1,690,834 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 4,130 |  | 4,250 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 341,802 |  | 331,270 |  |  |
Non-PCI Loans |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 16,888 |  | 4,032 |  |  |
Collectively evaluated for impairment | 313,732 |  | 307,268 |  |  |
Allowance for loan losses | 330,620 | $ 317,880 | 311,300 | 301,511 | $ 297,607 | $ 287,070
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 208,645 |  | 118,918 |  |  |
Collectively evaluated for impairment | 33,250,865 |  | 31,958,248 |  |  |
Loans held-for-investment | 33,459,510 |  | 32,077,166 |  |  |
Non-PCI Loans | Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 25,146,180 |  | 24,124,659 |  |  |
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 14,137 |  | 1,219 |  |  |
Collectively evaluated for impairment | 191,366 |  | 190,121 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 143,120 |  | 57,088 |  |  |
Collectively evaluated for impairment | 12,257,970 |  | 11,997,730 |  |  |
Loans held-for-investment | 12,401,090 |  | 12,054,818 |  |  |
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 134 |  | 208 |  |  |
Collectively evaluated for impairment | 40,378 |  | 38,823 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 26,945 |  | 30,352 |  |  |
Collectively evaluated for impairment | 9,695,637 |  | 9,254,231 |  |  |
Loans held-for-investment | 9,722,582 |  | 9,284,583 |  |  |
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 64 |  | 75 |  |  |
Collectively evaluated for impairment | 18,510 |  | 19,208 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 5,253 |  | 5,560 |  |  |
Collectively evaluated for impairment | 2,342,498 |  | 2,240,946 |  |  |
Loans held-for-investment | 2,347,751 |  | 2,246,506 |  |  |
Non-PCI Loans | Commercial lending | Construction and land |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 22,961 |  | 20,282 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 674,757 |  | 538,752 |  |  |
Loans held-for-investment | 674,757 |  | 538,752 |  |  |
Non-PCI Loans | Consumer lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 8,313,330 |  | 7,952,507 |  |  |
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 48 |  | 34 |  |  |
Collectively evaluated for impairment | 32,715 |  | 31,306 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 20,890 |  | 13,460 |  |  |
Collectively evaluated for impairment | 6,382,738 |  | 5,925,798 |  |  |
Loans held-for-investment | 6,403,628 |  | 5,939,258 |  |  |
Non-PCI Loans | Consumer lending | HELOCs |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 5 |  | 5 |  |  |
Collectively evaluated for impairment | 6,172 |  | 5,769 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 9,933 |  | 9,956 |  |  |
Collectively evaluated for impairment | 1,557,967 |  | 1,672,023 |  |  |
Loans held-for-investment | 1,567,900 |  | 1,681,979 |  |  |
Non-PCI Loans | Consumer lending | Other consumer |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 2,500 |  | 2,491 |  |  |
Collectively evaluated for impairment | 1,630 |  | 1,759 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 2,504 |  | 2,502 |  |  |
Collectively evaluated for impairment | 339,298 |  | 328,768 |  |  |
Loans held-for-investment | 341,802 |  | 331,270 |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 5 | $ 14 | 22 | $ 39 | $ 47 | $ 58
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 270,867 |  | 308,023 |  |  |
Acquired with deteriorated credit quality | Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 172,363 |  | 201,972 |  |  |
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 | 1,877 |  | 2,152 |  |  |
Acquired with deteriorated credit quality | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 5 |  | 22 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 145,851 |  | 165,252 |  |  |
Acquired with deteriorated credit quality | Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 24,594 |  | 34,526 |  |  |
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 | 41 |  | 42 |  |  |
Acquired with deteriorated credit quality | Consumer lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 98,504 |  | 106,051 |  |  |
Acquired with deteriorated credit quality | Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 91,254 |  | 97,196 |  |  |
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 | 7,250 |  | 8,855 |  |  |
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 |  |  |

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