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Parent Company Financial Statements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets |  |  |  |
Overnight investments | $ 1,107,844 | $ 797,406 |  |
Investment in marketable equity securities | 82,333 | 92,599 |  |
Investment securities available for sale | 7,059,674 | 4,557,110 |  |
Other assets | 610,891 | 433,595 |  |
Total assets | 39,824,496 | 35,408,629 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 738,233 | 572,287 |  |
Long-term obligations | 588,638 | 319,867 |  |
Other liabilities | 367,810 | 249,443 |  |
Stockholders' equity | 3,586,184 | 3,488,954 | $ 3,334,064 | $ 3,012,427
Total liabilities and shareholders' equity | 39,824,496 | 35,408,629 |  |
Income Statement [Abstract] |  |  |  |
Interest expense | 92,642 | 36,857 | 43,794 |
Net interest income | 1,311,369 | 1,208,900 | 1,059,896 |
Dividends from subsidiaries | 149,819 |  |  |
Income tax benefit | 134,677 | 103,297 | 219,946 |
Net income | 457,371 | 400,313 | 323,752 |
OPERATING ACTIVITIES |  |  |  |
Net income | 457,371 | 400,313 | 323,752 |
Net amortization of premiums and accretion of discounts | (34,040) | (36,567) | (40,028) |
Marketable equity securities (gains) losses, net | (20,625) | 7,610 | 0 |
Gain on elimination of acquired debt | 0 | (26,553) | (919) |
Change in other assets | (28,097) | (3,961) | (31,933) |
Change in other liabilities | (19,584) | (40,895) | (25,939) |
Net cash provided by (Used in) Operating Activities | 540,569 | 457,336 | 355,258 |
INVESTING ACTIVITIES |  |  |  |
Net change in overnight investments | (65,181) | 601,979 | 586,279 |
Purchases of marketable equity securities | (26,166) | (2,818) | 0 |
Proceeds from sales of marketable equity securities | 56,749 | 9,528 | 0 |
Net Cash Provided by (Used in) Investing Activities | (1,558,469) | 97,573 | (668,672) |
FINANCING ACTIVITIES |  |  |  |
Net change in short-term borrowings | (27,703) | (246,517) | (44,680) |
Proceeds from Issuance of Long-term Debt | (200,000) | (125,000) | (175,000) |
Repurchase of common stock | (453,123) | (163,095) | 0 |
Cash dividends paid | (18,137) | (16,779) | (14,412) |
Net cash used by financing activities | 1,067,179 | (563,619) | 109,823 |
Net change in cash | 49,279 | (8,710) | (203,591) |
Cash and due from banks at beginning of period | 327,440 | 336,150 | 539,741 |
Cash and due from banks at end of period | 376,719 | 327,440 | 336,150 |
Cash payments for |  |  |  |
Income taxes | 83,038 | 73,806 | 88,565 |
Parent |  |  |  |
Assets |  |  |  |
Cash | 4,573 | 7,188 |  |
Overnight investments | 2,547 | 385 |  |
Investment in marketable equity securities | 82,333 | 92,599 |  |
Investment securities available for sale | 3,015 | 6,456 |  |
Investment in Banking Subsidiaries | 3,763,947 | 3,314,292 |  |
Investment in Other Subsidiaries | 3,555 | 41,830 |  |
Due from subsidiaries | 0 | 814 |  |
Note to banking subsidiaries | 0 | 100,000 |  |
Other assets | 45,164 | 42,810 |  |
Total assets | 3,905,134 | 3,606,374 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 105,677 | 105,546 |  |
Long-term obligations | 201,702 | 0 |  |
Due to Affiliate | 1,670 | 299 |  |
Other liabilities | 9,901 | 11,575 |  |
Stockholders' equity | 3,586,184 | 3,488,954 |  |
Total liabilities and shareholders' equity | 3,905,134 | 3,606,374 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 1,327 | 1,362 | 921 |
Interest expense | 7,187 | 5,154 | 4,814 |
Net interest income | (5,860) | (3,792) | (3,893) |
Dividends from subsidiaries |  | 242,910 | 50,400 |
Dividend Income, Banking Subsidiaries |  |  | 50,424 |
Marketable equity securities losses, net | 20,625 | (7,610) | 0 |
Other income (loss) | 257 | 347 | 8,437 |
Other operating expense | 9,497 | 11,127 | 6,881 |
Income tax benefit | 892 | (5,184) | (5,395) |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 155,344 | 220,728 | 48,087 |
Excess distributions (undistributed ) net income of subsidiaries | (302,919) | (174,401) | (270,270) |
Net income | 457,371 | 400,313 | 323,752 |
Income before equity in undistributed net income of subsidiaries | 154,452 | 225,912 | 53,482 |
OPERATING ACTIVITIES |  |  |  |
Net income | 457,371 | 400,313 | 323,752 |
Excess distributions (undistributed ) net income of subsidiaries | (302,919) | (174,401) | (270,270) |
Net amortization of premiums and accretion of discounts | 119 | 88 | 759 |
Gain on elimination of acquired debt | 0 | (160) | (919) |
Gain (Loss) on Disposition of Other Assets | 2,185 | 381 | 1,626 |
Change in other assets | (2,001) | 3,657 | (10,509) |
Securities (gains) losses | (20) | 0 | (8,003) |
Change in other liabilities | 981 | (2,595) | 6,310 |
Net cash provided by (Used in) Operating Activities | 130,721 | 234,131 | 39,494 |
INVESTING ACTIVITIES |  |  |  |
Net change in loans | 100,000 | (100,000) | 0 |
Net change in overnight investments | 2,162 | 14,091 | 11,681 |
Purchases of marketable equity securities | (26,166) | (2,818) | 0 |
Proceeds from sales of marketable equity securities | 56,749 | 9,528 | 0 |
Purchases of investment securities | 0 | (6,438) | (28,012) |
Maturities and sales of investment securities | 3,477 | 9,997 | 32,463 |
Net Cash Provided by (Used in) Investing Activities | 136,222 | (75,640) | 16,132 |
FINANCING ACTIVITIES |  |  |  |
Net change in short-term borrowings | 40,277 | (15,000) | 0 |
Repayment of long-term obligations | (3,575) | (1,840) | (4,081) |
Proceeds from Issuance of Long-term Debt | 165,000 | 0 | 0 |
Repurchase of common stock | (453,123) | (163,095) | 0 |
Cash dividends paid | (18,137) | (16,779) | (14,412) |
Net cash used by financing activities | (269,558) | (196,714) | (18,493) |
Net change in cash | (2,615) | (38,223) | 37,133 |
Cash and due from banks at beginning of period | 7,188 | 45,411 | 8,278 |
Cash and due from banks at end of period | 4,573 | 7,188 | 45,411 |
Cash payments for |  |  |  |
Interest | 7,187 | 5,154 | 4,814 |
Income taxes | $ 78,345 | $ 73,806 | $ 88,565 |

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