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Loans Receivable and Allowance for Credit Losses (Loans Held-for-Sale Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale | [1] |  | $ 613,088 | $ 819,100 | $ 1,747,621
Loans transferred from held-for-sale to held-for-investment |  |  | 0 | (4,943) | (53,376)
Securitization of loans held-for-investment |  |  |  | 201,675 |
Sales |  |  | 577,964 | 628,669 | 1,702,197
Purchases |  |  | 534,730 | 1,141,028 | 282,407
Gross charge-offs |  |  | (473) | (1,900) | (5,100)
Held-to-maturity investment security |  |  | 0 | 143,971 |
Gain (loss) on sale of loans and leases |  |  | 8,900 | 10,600 | 27,800
Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 534,956 |  |
Lower of cost or fair value adjustment |  |  | 61 | 5,600 | 3,000
Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 78,132 |  |
Commercial And Industrial, Commercial Real Estate, And Single-Family Residential Loans [Member] | Loans receivable, originated |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Sales |  |  | 178,200 |  |
Multifamily Residential, Commercial And Industrial, And Commercial Real Estate [Member] | Loans receivable, originated |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Sales |  |  |  | 369,600 |
Single-family Residential, Commercial And Industrial [Member] | Loans receivable, originated |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Sales |  |  |  |  | 1,040,000
Loans Sold in Secondary Market | Loans receivable, purchased |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Sales |  |  | 399,800 | 259,100 | 661,900
Residential | Residential loan | Multifamily | Loans receivable, originated |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Held-to-maturity investment security |  | $ 160,100 |  |  |
Gain (loss) on sale of loans and leases |  | 1,100 |  |  |
Servicing asset, amortized cost |  | $ 641 |  |  |
Residential | Residential loan | Single-family |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Purchases |  |  |  | 488,300 |
Commercial Lending | C&I |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 434,137 | 779,854
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | 0
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 476,644 | 434,137 | 779,682
Purchases |  |  | 503,359 | 646,793 | 233,090
Commercial Lending | C&I | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 476,644 |  |
Commercial Lending | C&I | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 17,590 |  |
Commercial Lending | CRE |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 110,927 | 227
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | 0
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 52,217 | 110,927 | 227
Purchases |  |  | 0 | 0 | 0
Commercial Lending | CRE | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 52,217 |  |
Commercial Lending | CRE | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 36,783 |  |
Commercial Lending | Residential loan | Multifamily |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 269,791 | 0
Loans transferred from held-for-sale to held-for-investment |  |  |  | (4,943) | 0
Securitization of loans held-for-investment |  |  |  | 201,675 |
Sales |  |  | 531 | 61,268 | 0
Purchases |  |  | 2,311 | 5,658 | 11,046
Commercial Lending | Residential loan | Multifamily | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 531 |  |
Commercial Lending | Residential loan | Multifamily | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 12,448 |  |
Commercial Lending | Construction and land |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 4,245 | 4,754
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | 0
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 1,609 | 4,245 | 4,754
Purchases |  |  | 0 | 0 | 0
Commercial Lending | Construction and land | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 1,609 |  |
Commercial Lending | Construction and land | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 241 |  |
Consumer Lending | Residential loan | Single-family |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 0 | 962,538
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | (53,376)
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 21,058 | 18,092 | 907,373
Purchases |  |  | 29,060 | 488,577 | 38,271
Consumer Lending | Residential loan | Single-family | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 249 |  |
Consumer Lending | Residential loan | Single-family | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 6,416 |  |
Consumer Lending | HELOCs |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 0 | 248
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | 0
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 0 | 0 | 248
Purchases |  |  | 0 | 0 | 0
Consumer Lending | HELOCs | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 0 |  |
Consumer Lending | HELOCs | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 4,309 |  |
Consumer Lending | Other consumer |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  |  | 0 | 0
Loans transferred from held-for-sale to held-for-investment |  |  |  | 0 | 0
Securitization of loans held-for-investment |  |  |  | 0 |
Sales |  |  | 25,905 | 0 | 9,913
Purchases |  |  | 0 | $ 0 | $ 0
Consumer Lending | Other consumer | Loans held-for-sale |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | 3,706 |  |
Consumer Lending | Other consumer | Loans held-for-sale | Desert Community Bank |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans transferred from held-for-investment to held-for-sale |  |  | $ 345 |  |
[1] | December 31, 2017 amount includes loans transferred from held-for-investment to branch assets held-for-sale.

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