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Parent Company Financial Information - Statements of Condition (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets: |  |  |  |
Securities available-for-sale (a) | $ 4,626,470 | $ 5,170,255 |  |
Securities available-for-sale (a) |  | 5,170,255 |  |
Allowance for loan losses | (180,424) | (189,555) | $ (202,068) | $ (210,242)
Investments in subsidiaries: |  |  |  |
Other assets | 1,802,939 | 1,723,189 |  |
Total assets | 40,832,258 | 41,423,388 |  |
Liabilities: |  |  |  |
Term borrowings (Note 10) | 1,170,963 | 1,218,097 |  |
Total liabilities | 36,046,878 | 36,842,900 |  |
Total equity | 4,785,380 | 4,580,488 | $ 2,705,084 | $ 2,639,586
Total liabilities and equity | 40,832,258 | 41,423,388 |  |
Parent Company |  |  |  |
Assets: |  |  |  |
Cash | 334,485 | 254,938 |  |
Securities available-for-sale (a) | 0 |  |  |
Securities available-for-sale (a) |  | 1,836 |  |
Notes receivable | 2,888 | 3,067 |  |
Allowance for loan losses | (925) | (925) |  |
Investments in subsidiaries: |  |  |  |
Bank | 4,741,105 | 4,618,249 |  |
Non-bank | 20,281 | 22,932 |  |
Other assets | 180,757 | 207,878 |  |
Total assets | 5,278,591 | 5,107,975 |  |
Liabilities: |  |  |  |
Accrued employee benefits and other liabilities | 158,648 | 149,124 |  |
Term borrowings (Note 10) | 629,994 | 673,794 |  |
Total liabilities | 788,642 | 822,918 |  |
Total equity | 4,489,949 | 4,285,057 |  |
Total liabilities and equity | $ 5,278,591 | $ 5,107,975 |  |

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