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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Allowance for loan losses |  |  |  |
Allowance for loan losses | $ 297,654 | $ 287,128 | $ 263,094 |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 29,555,248 | 28,975,718 |  |
Commercial lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 22,465,245 | 22,210,001 |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 169,695 | 163,058 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 10,818,304 | 10,697,231 |  |
Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 39,718 | 41,237 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 9,022,746 | 8,936,897 |  |
Commercial lending | Real estate loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 18,499 | 19,109 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 1,954,855 | 1,916,176 |  |
Commercial lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 32,220 | 26,881 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 669,340 | 659,697 |  |
Consumer lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 7,090,003 | 6,765,717 |  |
Consumer lending | Real estate loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 25,957 | 26,362 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 4,930,580 | 4,646,289 |  |
Consumer lending | Home equity lines of credit (“HELOCs”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 7,041 | 7,354 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 1,775,443 | 1,782,924 |  |
Consumer lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 4,524 | 3,127 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 383,980 | 336,504 |  |
Non-PCI Loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 32,319 | 19,895 |  |
Collectively evaluated for impairment | 265,288 | 267,175 |  |
Allowance for loan losses | 297,607 | 287,070 | 263,007 | $ 260,402
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 173,731 | 170,887 |  |
Collectively evaluated for impairment | 28,929,114 | 28,322,544 |  |
Loans held-for-investment | 29,102,845 | 28,493,431 |  |
Non-PCI Loans | Commercial lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 22,137,985 | 21,859,099 |  |
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 28,564 | 16,094 |  |
Collectively evaluated for impairment | 141,131 | 146,964 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 98,981 | 98,685 |  |
Collectively evaluated for impairment | 10,708,281 | 10,586,751 |  |
Loans held-for-investment | 10,807,262 | 10,685,436 |  |
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 615 | 684 |  |
Collectively evaluated for impairment | 39,056 | 40,495 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 34,916 | 35,556 |  |
Collectively evaluated for impairment | 8,727,994 | 8,623,653 |  |
Loans held-for-investment | 8,762,910 | 8,659,209 |  |
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 103 | 88 |  |
Collectively evaluated for impairment | 18,396 | 19,021 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 9,417 | 10,636 |  |
Collectively evaluated for impairment | 1,889,100 | 1,844,492 |  |
Loans held-for-investment | 1,898,517 | 1,855,128 |  |
Non-PCI Loans | Commercial lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 32,220 | 26,881 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 3,973 | 3,973 |  |
Collectively evaluated for impairment | 665,323 | 655,353 |  |
Loans held-for-investment | 669,296 | 659,326 |  |
Non-PCI Loans | Consumer lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 6,964,860 | 6,634,332 |  |
Non-PCI Loans | Consumer lending | Real estate loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 541 | 534 |  |
Collectively evaluated for impairment | 25,416 | 25,828 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 15,819 | 14,338 |  |
Collectively evaluated for impairment | 4,802,275 | 4,514,573 |  |
Loans held-for-investment | 4,818,094 | 4,528,911 |  |
Non-PCI Loans | Consumer lending | Home equity lines of credit (“HELOCs”) |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 5 | 4 |  |
Collectively evaluated for impairment | 7,036 | 7,350 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 8,134 | 5,208 |  |
Collectively evaluated for impairment | 1,754,652 | 1,763,709 |  |
Loans held-for-investment | 1,762,786 | 1,768,917 |  |
Non-PCI Loans | Consumer lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 2,491 | 2,491 |  |
Collectively evaluated for impairment | 2,033 | 636 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 2,491 | 2,491 |  |
Collectively evaluated for impairment | 381,489 | 334,013 |  |
Loans held-for-investment | 383,980 | 336,504 |  |
Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 47 | 58 | $ 87 | $ 118
Recorded investment in loans |  |  |  |
Loans held-for-investment | 452,403 | 482,287 |  |
Acquired with deteriorated credit quality | Commercial lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 327,260 | 350,902 |  |
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 | 11,042 | 11,795 |  |
Acquired with deteriorated credit quality | Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 47 | 58 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 259,836 | 277,688 |  |
Acquired with deteriorated credit quality | Commercial lending | Real estate loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 56,338 | 61,048 |  |
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 | 44 | 371 |  |
Acquired with deteriorated credit quality | Consumer lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 125,143 | 131,385 |  |
Acquired with deteriorated credit quality | Consumer lending | Real estate loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 112,486 | 117,378 |  |
Acquired with deteriorated credit quality | Consumer lending | Home equity lines of credit (“HELOCs”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 12,657 | 14,007 |  |
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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