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Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for loan losses |  |  |
Allowance, beginning of period | $ 260,520 | $ 264,959 |
Gross charge-offs | (473) | (1,900) | $ (5,100)
Allowance, end of period | 287,128 | 260,520 | 264,959
Commercial Lending | C&I |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 142,167 |  |
Allowance, end of period | 163,058 | 142,167 |
Commercial Lending | CRE |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 47,927 |  |
Allowance, end of period | 41,237 | 47,927 |
Commercial Lending | Residential loan | Multifamily |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 17,543 |  |
Allowance, end of period | 19,109 | 17,543 |
Commercial Lending | Construction and land |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 24,989 |  |
Allowance, end of period | 26,881 | 24,989 |
Consumer Lending | Residential loan | Single-family |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 19,795 |  |
Allowance, end of period | 26,362 | 19,795 |
Consumer Lending | HELOCs |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 7,506 |  |
Allowance, end of period | 7,354 | 7,506 |
Consumer Lending | Other consumer |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 593 |  |
Allowance, end of period | 3,127 | 593 |
Non-PCI impaired loans |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 260,402 | 264,600 | 260,965
Provision for (reversal of) on loans | 49,129 | 31,959 | 6,924
Gross charge-offs | (38,975) | (48,508) | (24,254)
Gross recoveries | 16,514 | 12,351 | 20,965
Net charge-offs | (22,461) | (36,157) | (3,289)
Allowance, end of period | 287,070 | 260,402 | 264,600
Non-PCI impaired loans | Commercial Lending | C&I |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (38,118) | (47,739) | (20,423)
Gross recoveries | 12,065 | 8,453 | 8,782
Non-PCI impaired loans | Commercial Lending | CRE |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | 0 | (464) | (1,052)
Gross recoveries | 2,111 | 1,488 | 2,488
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (635) | (29) | (1,650)
Gross recoveries | 1,357 | 1,476 | 4,298
Non-PCI impaired loans | Commercial Lending | Construction and land |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (149) | (117) | (493)
Gross recoveries | 259 | 203 | 4,647
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (1) | (137) | (36)
Gross recoveries | 546 | 401 | 323
Non-PCI impaired loans | Consumer Lending | HELOCs |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (55) | (9) | (98)
Gross recoveries | 24 | 7 | 54
Non-PCI impaired loans | Consumer Lending | Other consumer |  |  |
Allowance for loan losses |  |  |
Gross charge-offs | (17) | (13) | (502)
Gross recoveries | 152 | 323 | 373
PCI Loans |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 118 | 359 | 714
Provision for (reversal of) on loans | (60) | (241) | (355)
Allowance, end of period | 58 | 118 | $ 359
PCI Loans | Commercial Lending | C&I |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 1 |  |
Allowance, end of period | 0 | 1 |
PCI Loans | Commercial Lending | CRE |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 112 |  |
Allowance, end of period | 58 | 112 |
PCI Loans | Commercial Lending | Residential loan | Multifamily |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 0 |  |
Allowance, end of period | 0 | 0 |
PCI Loans | Commercial Lending | Construction and land |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 0 |  |
Allowance, end of period | 0 | 0 |
PCI Loans | Consumer Lending | Residential loan | Single-family |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 5 |  |
Allowance, end of period | 0 | 5 |
PCI Loans | Consumer Lending | HELOCs |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 0 |  |
Allowance, end of period | 0 | 0 |
PCI Loans | Consumer Lending | Other consumer |  |  |
Allowance for loan losses |  |  |
Allowance, beginning of period | 0 |  |
Allowance, end of period | $ 0 | $ 0 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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