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Loans Receivable and Allowance for Credit Losses (Non-PCI Impaired Loans) (Details) - Non-PCI Loans - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | $ 236,546 |  | $ 236,546 |  | $ 152,627
Recorded Investment With No Allowance | 142,311 |  | 142,311 |  | 87,812
Recorded Investment With Allowance | 66,334 |  | 66,334 |  | 31,106
Total Recorded Investment | 208,645 |  | 208,645 |  | 118,918
Related Allowance | 16,888 |  | 16,888 |  | 4,032
Average Recorded Investment | 257,108 | $ 182,484 | 269,604 | $ 195,628 |
Recognized Interest Income | 1,444 | 396 | 2,500 | 1,011 |
Commercial lending |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 201,836 |  | 201,836 |  | 125,420
Recorded Investment With No Allowance | 133,596 |  | 133,596 |  | 79,713
Recorded Investment With Allowance | 41,722 |  | 41,722 |  | 13,287
Total Recorded Investment | 175,318 |  | 175,318 |  | 93,000
Related Allowance | 14,335 |  | 14,335 |  | 1,502
Average Recorded Investment | 217,782 | 151,645 | 226,892 | 162,909 |
Recognized Interest Income | 1,277 | 263 | 2,186 | 750 |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 163,004 |  | 163,004 |  | 82,963
Recorded Investment With No Allowance | 105,843 |  | 105,843 |  | 48,479
Recorded Investment With Allowance | 37,277 |  | 37,277 |  | 8,609
Total Recorded Investment | 143,120 |  | 143,120 |  | 57,088
Related Allowance | 14,137 |  | 14,137 |  | 1,219
Average Recorded Investment | 182,689 | 103,767 | 189,553 | 112,193 |
Recognized Interest Income | 1,081 | 95 | 1,816 | 357 |
Commercial lending | Commercial real estate (“CRE”) |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 33,071 |  | 33,071 |  | 36,426
Recorded Investment With No Allowance | 25,351 |  | 25,351 |  | 28,285
Recorded Investment With Allowance | 1,594 |  | 1,594 |  | 2,067
Total Recorded Investment | 26,945 |  | 26,945 |  | 30,352
Related Allowance | 134 |  | 134 |  | 208
Average Recorded Investment | 29,241 | 34,547 | 31,456 | 35,602 |
Recognized Interest Income | 135 | 116 | 249 | 259 |
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 5,761 |  | 5,761 |  | 6,031
Recorded Investment With No Allowance | 2,402 |  | 2,402 |  | 2,949
Recorded Investment With Allowance | 2,851 |  | 2,851 |  | 2,611
Total Recorded Investment | 5,253 |  | 5,253 |  | 5,560
Related Allowance | 64 |  | 64 |  | 75
Average Recorded Investment | 5,852 | 9,358 | 5,883 | 11,141 |
Recognized Interest Income | 61 | 52 | 121 | 134 |
Commercial lending | Construction and land |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Average Recorded Investment | 0 | 3,973 | 0 | 3,973 |
Recognized Interest Income | 0 | 0 | 0 | 0 |
Consumer lending |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 34,710 |  | 34,710 |  | 27,207
Recorded Investment With No Allowance | 8,715 |  | 8,715 |  | 8,099
Recorded Investment With Allowance | 24,612 |  | 24,612 |  | 17,819
Total Recorded Investment | 33,327 |  | 33,327 |  | 25,918
Related Allowance | 2,553 |  | 2,553 |  | 2,530
Average Recorded Investment | 39,326 | 30,839 | 42,712 | 32,719 |
Recognized Interest Income | 167 | 133 | 314 | 261 |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 22,234 |  | 22,234 |  | 14,670
Recorded Investment With No Allowance | 3,940 |  | 3,940 |  | 2,552
Recorded Investment With Allowance | 16,950 |  | 16,950 |  | 10,908
Total Recorded Investment | 20,890 |  | 20,890 |  | 13,460
Related Allowance | 48 |  | 48 |  | 34
Average Recorded Investment | 23,247 | 18,852 | 24,865 | 19,331 |
Recognized Interest Income | 129 | 115 | 258 | 228 |
Consumer lending | HELOCs |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 9,972 |  | 9,972 |  | 10,035
Recorded Investment With No Allowance | 4,775 |  | 4,775 |  | 5,547
Recorded Investment With Allowance | 5,158 |  | 5,158 |  | 4,409
Total Recorded Investment | 9,933 |  | 9,933 |  | 9,956
Related Allowance | 5 |  | 5 |  | 5
Average Recorded Investment | 13,564 | 9,496 | 15,321 | 10,897 |
Recognized Interest Income | 38 | 18 | 56 | 33 |
Consumer lending | Other consumer |  |  |  |  |
Impaired loans disclosures |  |  |  |  |
Unpaid Principal Balance | 2,504 |  | 2,504 |  | 2,502
Recorded Investment With No Allowance | 0 |  | 0 |  | 0
Recorded Investment With Allowance | 2,504 |  | 2,504 |  | 2,502
Total Recorded Investment | 2,504 |  | 2,504 |  | 2,502
Related Allowance | 2,500 |  | 2,500 |  | $ 2,491
Average Recorded Investment | 2,515 | 2,491 | 2,526 | 2,491 |
Recognized Interest Income | $ 0 | $ 0 | $ 0 | $ 0 |

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