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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | $ 345,576 |  | $ 311,322 | $ 310,041 |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 34,024,976 |  | 32,385,189 |  |  |
Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 25,359,688 |  | 24,326,631 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 218,869 |  | 189,117 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 12,301,002 |  | 12,056,970 |  |  |
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 37,473 |  | 40,666 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 9,749,583 |  | 9,260,199 |  |  |
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 20,307 |  | 19,885 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 2,589,203 |  | 2,470,668 |  |  |
Commercial lending | Construction and land |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 29,171 |  | 20,290 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 719,900 |  | 538,794 |  |  |
Consumer lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 8,665,288 |  | 8,058,558 |  |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 29,935 |  | 31,340 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 6,811,014 |  | 6,036,454 |  |  |
Consumer lending | HELOCs |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 5,856 |  | 5,774 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 1,540,121 |  | 1,690,834 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 3,965 |  | 4,250 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 314,153 |  | 331,270 |  |  |
Non-PCI Loans |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 16,454 |  | 4,032 |  |  |
Collectively evaluated for impairment | 329,122 |  | 307,268 |  |  |
Allowance for loan losses | 345,576 | $ 330,620 | 311,300 | 310,010 | $ 301,511 | $ 287,070
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 182,711 |  | 118,918 |  |  |
Collectively evaluated for impairment | 33,601,559 |  | 31,958,248 |  |  |
Loans held-for-investment | 33,784,270 |  | 32,077,166 |  |  |
Non-PCI Loans | Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 25,211,110 |  | 24,124,659 |  |  |
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 13,783 |  | 1,219 |  |  |
Collectively evaluated for impairment | 205,086 |  | 187,898 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 121,103 |  | 57,088 |  |  |
Collectively evaluated for impairment | 12,178,060 |  | 11,997,730 |  |  |
Loans held-for-investment | 12,299,163 |  | 12,054,818 |  |  |
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 98 |  | 208 |  |  |
Collectively evaluated for impairment | 37,375 |  | 40,436 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 24,876 |  | 30,352 |  |  |
Collectively evaluated for impairment | 9,602,454 |  | 9,066,813 |  |  |
Loans held-for-investment | 9,627,330 |  | 9,097,165 |  |  |
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 44 |  | 75 |  |  |
Collectively evaluated for impairment | 20,263 |  | 19,810 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 4,739 |  | 5,560 |  |  |
Collectively evaluated for impairment | 2,560,019 |  | 2,428,364 |  |  |
Loans held-for-investment | 2,564,758 |  | 2,433,924 |  |  |
Non-PCI Loans | Commercial lending | Construction and land |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 29,171 |  | 20,290 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 719,859 |  | 538,752 |  |  |
Loans held-for-investment | 719,859 |  | 538,752 |  |  |
Non-PCI Loans | Consumer lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 8,573,160 |  | 7,952,507 |  |  |
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 34 |  | 34 |  |  |
Collectively evaluated for impairment | 29,901 |  | 31,306 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 17,000 |  | 13,460 |  |  |
Collectively evaluated for impairment | 6,708,574 |  | 5,925,798 |  |  |
Loans held-for-investment | 6,725,574 |  | 5,939,258 |  |  |
Non-PCI Loans | Consumer lending | HELOCs |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 4 |  | 5 |  |  |
Collectively evaluated for impairment | 5,852 |  | 5,769 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 12,498 |  | 9,956 |  |  |
Collectively evaluated for impairment | 1,520,935 |  | 1,672,023 |  |  |
Loans held-for-investment | 1,533,433 |  | 1,681,979 |  |  |
Non-PCI Loans | Consumer lending | Other consumer |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Individually evaluated for impairment | 2,491 |  | 2,491 |  |  |
Collectively evaluated for impairment | 1,474 |  | 1,759 |  |  |
Recorded investment in loans |  |  |  |  |  |
Individually evaluated for impairment | 2,495 |  | 2,502 |  |  |
Collectively evaluated for impairment | 311,658 |  | 328,768 |  |  |
Loans held-for-investment | 314,153 |  | 331,270 |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 0 | $ 5 | 22 | $ 31 | $ 39 | $ 58
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 240,706 |  | 308,023 |  |  |
Acquired with deteriorated credit quality | Commercial lending |  |  |  |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 148,578 |  | 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 | 1,839 |  | 2,152 |  |  |
Acquired with deteriorated credit quality | Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Allowance for loan losses | 0 |  | 22 |  |  |
Recorded investment in loans |  |  |  |  |  |
Loans held-for-investment | 122,253 |  | 163,034 |  |  |
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 | 24,445 |  | 36,744 |  |  |
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 | 92,128 |  | 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 | 85,440 |  | 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 | 6,688 |  | 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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