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Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Allowance for loan losses |  |  |  |
Allowance for loan losses | $ 358,287 | $ 311,322 | $ 287,128 |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 34,778,539 | 32,385,189 |  |
Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 5,593 | 4,032 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 352,694 | 307,268 |  |
Allowance for loan losses | 358,287 | 311,300 | 287,070 | $ 260,402
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 198,117 | 118,918 |  |
Collectively evaluated for impairment | 34,357,551 | 31,958,248 |  |
Loans held-for-investment | 34,555,668 | 32,077,166 |  |
Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 22 | $ 58 | $ 118
Recorded investment in loans |  |  |  |
Loans held-for-investment | 222,871 | 308,023 |  |
Commercial Lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 25,914,252 | 24,326,631 |  |
Commercial Lending | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 3,033 | 1,502 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 25,777,039 | 24,124,659 |  |
Commercial Lending | Acquired with deteriorated credit quality |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 137,213 | 201,972 |  |
Commercial Lending | C&I |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 238,376 | 189,117 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 12,150,931 | 12,056,970 |  |
Commercial Lending | C&I | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 2,881 | 1,219 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 235,495 | 187,898 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 114,042 | 57,088 |  |
Collectively evaluated for impairment | 12,035,079 | 11,997,730 |  |
Loans held-for-investment | 12,149,121 | 12,054,818 |  |
Commercial Lending | C&I | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 1,810 | 2,152 |  |
Commercial Lending | CRE |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 40,509 | 40,666 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 10,278,448 | 9,260,199 |  |
Commercial Lending | CRE | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 97 | 208 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 40,412 | 40,436 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 21,618 | 30,352 |  |
Collectively evaluated for impairment | 10,143,629 | 9,066,813 |  |
Loans held-for-investment | 10,165,247 | 9,097,165 |  |
Commercial Lending | CRE | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 22 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 113,201 | 163,034 |  |
Commercial Lending | Residential loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 22,826 | 19,885 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 2,856,374 | 2,470,668 |  |
Commercial Lending | Residential loan | Multifamily | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 55 | 75 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 22,771 | 19,810 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 4,464 | 5,560 |  |
Collectively evaluated for impairment | 2,829,748 | 2,428,364 |  |
Loans held-for-investment | 2,834,212 | 2,433,924 |  |
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 22,162 | 36,744 |  |
Commercial Lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 19,404 | 20,290 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 628,499 | 538,794 |  |
Commercial Lending | Construction and land | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 0 | 0 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 19,404 | 20,290 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 19,691 | 0 |  |
Collectively evaluated for impairment | 608,768 | 538,752 |  |
Loans held-for-investment | 628,459 | 538,752 |  |
Commercial Lending | Construction and land | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 40 | 42 |  |
Consumer Lending |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 8,864,287 | 8,058,558 |  |
Consumer Lending | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 2,560 | 2,530 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 8,778,629 | 7,952,507 |  |
Consumer Lending | Acquired with deteriorated credit quality |  |  |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 85,658 | 106,051 |  |
Consumer Lending | Residential loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 28,527 | 31,340 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 7,108,590 | 6,036,454 |  |
Consumer Lending | Residential loan | Single-family | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 35 | 34 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 28,492 | 31,306 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 22,211 | 13,460 |  |
Collectively evaluated for impairment | 7,006,768 | 5,925,798 |  |
Loans held-for-investment | 7,028,979 | 5,939,258 |  |
Consumer Lending | Residential loan | Single-family | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 79,611 | 97,196 |  |
Consumer Lending | HELOCs |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 5,265 | 5,774 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 1,472,783 | 1,690,834 |  |
Consumer Lending | HELOCs | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 8 | 5 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 5,257 | 5,769 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 13,574 | 9,956 |  |
Collectively evaluated for impairment | 1,453,162 | 1,672,023 |  |
Loans held-for-investment | 1,466,736 | 1,681,979 |  |
Consumer Lending | HELOCs | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 6,047 | 8,855 |  |
Consumer Lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 3,380 | 4,250 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | 282,914 | 331,270 |  |
Consumer Lending | Other consumer | Non-PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Related Allowance | 2,517 | 2,491 |  |
Allowance for loan losses |  |  |  |
Collectively evaluated for impairment | 863 | 1,759 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 2,517 | 2,502 |  |
Collectively evaluated for impairment | 280,397 | 328,768 |  |
Loans held-for-investment | 282,914 | 331,270 |  |
Consumer Lending | Other consumer | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Loans held-for-investment | $ 0 | $ 0 |  |

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