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Loans Receivable and Allowance for Credit Losses (Non-PCI Impaired Loans) (Details) - Non-PCI impaired loans - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired loans disclosures |  |  |
Unpaid Principal Balance | $ 171,016 | $ 255,273 |
Recorded Investment With No Allowance | 79,064 | 121,934 |
Recorded Investment With Allowance | 91,823 | 84,121 |
Total Recorded Investment | 170,887 | 206,055 |
Individually evaluated for impairment | 19,895 | 12,701 |
Related Allowance | 19,895 | 12,701 |
Average Recorded Investment | 185,132 | 236,227 | $ 172,269
Recognized Interest Income | 2,989 | 4,711 | 1,714
Commercial Lending |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 149,037 | 235,822 |
Recorded Investment With No Allowance | 76,777 | 121,934 |
Recorded Investment With Allowance | 72,073 | 66,104 |
Total Recorded Investment | 148,850 | 188,038 |
Related Allowance | 16,866 | 11,983 |
Average Recorded Investment | 162,502 | 218,201 | 155,652
Recognized Interest Income | 2,517 | 4,201 | 1,425
Commercial Lending | C&I |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 98,889 | 167,466 |
Recorded Investment With No Allowance | 36,086 | 78,316 |
Recorded Investment With Allowance | 62,599 | 47,303 |
Total Recorded Investment | 98,685 | 125,619 |
Individually evaluated for impairment | 16,094 | 10,477 |
Average Recorded Investment | 110,662 | 148,986 | 85,290
Recognized Interest Income | 1,517 | 2,612 | 538
Commercial Lending | CRE |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 35,550 | 50,718 |
Recorded Investment With No Allowance | 28,699 | 32,507 |
Recorded Investment With Allowance | 6,857 | 14,001 |
Total Recorded Investment | 35,556 | 46,508 |
Individually evaluated for impairment | 684 | 1,263 |
Average Recorded Investment | 36,003 | 47,064 | 43,598
Recognized Interest Income | 578 | 1,253 | 536
Commercial Lending | Residential loan | Multifamily |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 10,625 | 11,181 |
Recorded Investment With No Allowance | 8,019 | 5,684 |
Recorded Investment With Allowance | 2,617 | 4,357 |
Total Recorded Investment | 10,636 | 10,041 |
Individually evaluated for impairment | 88 | 180 |
Average Recorded Investment | 11,455 | 15,763 | 24,024
Recognized Interest Income | 422 | 302 | 312
Commercial Lending | Construction and land |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 3,973 | 6,457 |
Recorded Investment With No Allowance | 3,973 | 5,427 |
Recorded Investment With Allowance | 0 | 443 |
Total Recorded Investment | 3,973 | 5,870 |
Individually evaluated for impairment | 0 | 63 |
Average Recorded Investment | 4,382 | 6,388 | 2,740
Recognized Interest Income | 0 | 34 | 39
Consumer Lending |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 21,979 | 19,451 |
Recorded Investment With No Allowance | 2,287 | 0 |
Recorded Investment With Allowance | 19,750 | 18,017 |
Total Recorded Investment | 22,037 | 18,017 |
Related Allowance | 3,029 | 718 |
Average Recorded Investment | 22,630 | 18,026 | 16,617
Recognized Interest Income | 472 | 510 | 289
Consumer Lending | Residential loan | Single-family |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 14,287 | 15,435 |
Recorded Investment With No Allowance | 0 | 0 |
Recorded Investment With Allowance | 14,338 | 14,335 |
Total Recorded Investment | 14,338 | 14,335 |
Individually evaluated for impairment | 534 | 687 |
Average Recorded Investment | 14,994 | 14,323 | 15,365
Recognized Interest Income | 417 | 447 | 242
Consumer Lending | HELOCs |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 5,201 | 4,016 |
Recorded Investment With No Allowance | 2,287 | 0 |
Recorded Investment With Allowance | 2,921 | 3,682 |
Total Recorded Investment | 5,208 | 3,682 |
Individually evaluated for impairment | 4 | 31 |
Average Recorded Investment | 5,494 | 3,703 | 1,252
Recognized Interest Income | 55 | 63 | 47
Consumer Lending | Other consumer |  |  |
Impaired loans disclosures |  |  |
Unpaid Principal Balance | 2,491 |  |
Recorded Investment With No Allowance | 0 |  |
Recorded Investment With Allowance | 2,491 |  |
Total Recorded Investment | 2,491 |  |
Individually evaluated for impairment | 2,491 | 0 |
Average Recorded Investment | 2,142 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 0

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