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Parent Company Condensed Financial Statements (Condensed Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash placed with subsidiary bank | $ 2,174,592 | $ 1,878,503 | $ 1,360,887 | $ 1,039,885
Available-for-sale investment securities, at fair value | 3,016,752 | 3,335,795 |  |
Investments in tax credit investments, net | 224,551 | 173,280 |  |
Other assets | 678,952 | 782,400 |  |
TOTAL | 37,150,249 | 34,788,840 | 32,350,922 |
LIABILITIES |  |  |  |
Long-term debt | 171,577 | 186,327 |  |
Total liabilities | 33,308,298 | 31,361,099 |  |
STOCKHOLDERS’ EQUITY |  |  |  |
Common stock, $0.001 par value, 200,000,000 shares authorized; 165,214,770 and 164,604,072 shares issued in 2017 and 2016, respectively | 165 | 164 |  |
Additional paid-in capital | 1,755,330 | 1,727,434 |  |
Retained earnings | 2,576,302 | 2,187,676 |  |
Treasury stock, at cost — 20,671,710 shares in 2017 and 20,436,621 shares in 2016 | (452,327) | (439,387) |  |
Accumulated other comprehensive loss, net of tax | (37,519) | (48,146) |  |
Total stockholders’ equity | 3,841,951 | 3,427,741 | 3,122,950 | 2,856,111
TOTAL | 37,150,249 | 34,788,840 |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash placed with subsidiary bank | 159,566 | 39,264 | $ 18,898 | $ 211,053
Available-for-sale investment securities, at fair value | 0 | 9,338 |  |
Investments in tax credit investments, net | 25,511 | 32,245 |  |
Other assets | 7,062 | 4,812 |  |
TOTAL | 4,026,499 | 3,638,318 |  |
LIABILITIES |  |  |  |
Long-term debt | 171,577 | 186,327 |  |
Other liabilities | 12,971 | 24,250 |  |
Total liabilities | 184,548 | 210,577 |  |
STOCKHOLDERS’ EQUITY |  |  |  |
Common stock, $0.001 par value, 200,000,000 shares authorized; 165,214,770 and 164,604,072 shares issued in 2017 and 2016, respectively | 165 | 164 |  |
Additional paid-in capital | 1,755,330 | 1,727,434 |  |
Retained earnings | 2,576,302 | 2,187,676 |  |
Treasury stock, at cost — 20,671,710 shares in 2017 and 20,436,621 shares in 2016 | (452,327) | (439,387) |  |
Accumulated other comprehensive loss, net of tax | (37,519) | (48,146) |  |
Total stockholders’ equity | 3,841,951 | 3,427,741 |  |
TOTAL | 4,026,499 | 3,638,318 |  |
Parent Company | Bank |  |  |  |
ASSETS |  |  |  |
Investments in subsidiaries | 3,830,696 | 3,546,984 |  |
Parent Company | Nonbank |  |  |  |
ASSETS |  |  |  |
Investments in subsidiaries | $ 3,664 | $ 5,675 |  |

X
- Definition Represents the net amount of investments in the projects, excluding affordable housing projects, that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details
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