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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 |  |

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