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Parent Company Financial Information (Statements of Condition) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets: |  |  |  |
Securities available-for-sale (Note 3) | $ 5,170,255 | $ 3,943,499 |  |
Allowance for loan losses | (189,555) | (202,068) | $ (210,242) | $ (232,448)
Investments in subsidiaries: |  |  |  |
Other assets | 1,723,189 | 1,406,711 |  |
Total assets | 41,423,388 | 28,555,231 |  |
Liabilities: |  |  |  |
Term borrowings (Note 10) | 1,218,097 | 1,040,656 |  |
Total liabilities | 36,842,900 | 25,850,147 |  |
Total equity | 4,580,488 | 2,705,084 | $ 2,639,586 | $ 2,581,590
Total liabilities and equity | 41,423,388 | 28,555,231 |  |
Parent Company |  |  |  |
Assets: |  |  |  |
Cash | 254,938 | 226,326 |  |
Securities available-for-sale (Note 3) | 1,836 | 2,035 |  |
Notes receivable | 3,067 | 3,209 |  |
Allowance for loan losses | (925) | (925) |  |
Investments in subsidiaries: |  |  |  |
Bank | 4,618,249 | 2,596,582 |  |
Non-bank | 22,932 | 23,996 |  |
Other assets | 207,878 | 189,360 |  |
Total assets | 5,107,975 | 3,040,583 |  |
Liabilities: |  |  |  |
Accrued employee benefits and other liabilities | 149,124 | 141,729 |  |
Term borrowings (Note 10) | 673,794 | 489,201 |  |
Total liabilities | 822,918 | 630,930 |  |
Total equity | 4,285,057 | 2,409,653 |  |
Total liabilities and equity | $ 5,107,975 | $ 3,040,583 |  |

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