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Parent Company Financial Statements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets |  |  |  |
Overnight investments | $ 9,114,660 | $ 4,347,336 |  |
Investment in marketable equity securities | 97,528 | 91,680 |  |
Investment securities available for sale | 9,203,427 | 7,014,243 |  |
Total other assets | 1,657,356 | 783,953 |  |
Total assets | 58,308,140 | 49,957,680 |  |
Liabilities and Shareholders' Equity |  |  |  |
Long-term obligations | 1,194,378 | 1,248,163 |  |
Other liabilities | 381,326 | 391,552 |  |
Stockholders' equity | 4,737,241 | 4,229,268 | $ 3,586,184 | $ 3,488,954
Total liabilities and shareholders' equity | 58,308,140 | 49,957,680 |  |
Income Statement [Abstract] |  |  |  |
Interest expense | 60,676 | 95,857 | 92,642 |
Net interest income | 1,390,334 | 1,388,169 | 1,311,369 |
Dividends from subsidiaries | 173,091 | 229,700 | 149,800 |
Income tax benefit | 154,202 | 126,159 | 134,677 |
Net income | 547,459 | 491,723 | 457,371 |
Net income available to common shareholders | 528,915 | 477,661 | 457,371 |
OPERATING ACTIVITIES |  |  |  |
Net income | 547,459 | 491,723 | 457,371 |
Net amortization of premiums and accretion of discounts | 11,151 | (8,513) | (27,263) |
Marketable equity securities gains, net | (34,081) | (29,395) | (20,625) |
Change in other assets | (12,910) | (7,286) | (24,274) |
Change in other liabilities | 6,854 | (6,115) | (15,992) |
Net cash provided by (Used in) Operating Activities | (283,783) | 375,819 | 578,248 |
INVESTING ACTIVITIES |  |  |  |
Net change in overnight investments | (4,767,324) | (3,204,363) | (65,181) |
Purchases of marketable equity securities | (1,563) | (333,140) | (26,166) |
Proceeds from sales of marketable equity securities | 29,796 | 352,835 | 56,749 |
Investments in Majority-owned Subsidiaries | 0 | (422,500) | 0 |
Net Cash Provided by (Used in) Investing Activities | (7,568,426) | (9,907,562) | (1,596,148) |
FINANCING ACTIVITIES |  |  |  |
Net change in short-term borrowings | (52,386) | (96,746) | (27,703) |
Proceeds from Issuance of Long-term Debt | 0 | (400,000) | (200,000) |
Repurchase of common stock | 0 | (333,755) | (453,123) |
Cash dividends paid | (41,612) | (30,393) | (18,137) |
Net cash used by financing activities | 7,827,975 | 9,517,072 | 1,067,179 |
Cash and due from banks at beginning of period | 4,270,000 |  |  |
Cash and due from banks at end of period | 9,030,000 | 4,270,000 |  |
Cash payments for |  |  |  |
Income taxes | 870,467 | 116,583 | 83,038 |
Net proceeds from subordinated notes issuance | 0 | 345,849 | 0 |
Net proceeds from preferred stock issuance | 0 | 339,937 | 0 |
Parent |  |  |  |
Assets |  |  |  |
Cash | 173,719 | 49,716 |  |
Overnight investments | 5,716 | 1,607 |  |
Investment in marketable equity securities | 97,528 | 91,680 |  |
Investment securities available for sale | 0 | 2,010 |  |
Investment in Banking Subsidiaries | 4,987,350 | 4,621,676 |  |
Investment in Other Subsidiaries | 3,237 | 3,241 |  |
Due from subsidiaries | 0 | 786 |  |
Total other assets | 41,874 | 48,591 |  |
Total assets | 5,309,424 | 4,819,307 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 453,313 | 452,350 |  |
Long-term obligations | 107,825 | 128,125 |  |
Due to Affiliate | 2,829 | 0 |  |
Other liabilities | 8,216 | 9,564 |  |
Stockholders' equity | 4,737,241 | 4,229,268 |  |
Total liabilities and shareholders' equity | 5,309,424 | 4,819,307 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 2,011 | 3,952 | 1,327 |
Interest expense | 16,578 | 16,817 | 7,187 |
Net interest income | (14,567) | (12,865) | (5,860) |
Dividends from subsidiaries |  | 229,685 |  |
Dividend Income, Banking Subsidiaries |  |  | 149,819 |
Marketable equity securities losses, net | 34,081 | 29,395 | 20,625 |
Other income (loss) | 66 | 574 | 257 |
Other operating expense | 11,275 | 13,168 | 9,497 |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 181,396 | 233,621 | 155,344 |
Income tax benefit | 2,089 | 879 | 892 |
Income before equity in undistributed net income of subsidiaries | 179,307 | 232,742 | 154,452 |
Excess distributions (undistributed ) net income of subsidiaries | (368,152) | (258,981) | (302,919) |
Net income | 547,459 | 491,723 | 457,371 |
Preferred stock dividends | 18,544 | 14,062 | 0 |
Net income available to common shareholders | 528,915 | 477,661 | 457,371 |
OPERATING ACTIVITIES |  |  |  |
Net income | 547,459 | 491,723 | 457,371 |
Excess distributions (undistributed ) net income of subsidiaries | (368,152) | (258,981) | (302,919) |
Net amortization of premiums and accretion of discounts | 963 | 824 | 119 |
Gain (Loss) on Disposition of Other Assets | (3,615) | 2,456 | 2,185 |
Change in other assets | 6,722 | (3,074) | (2,001) |
Securities (gains) losses | 0 | 0 | (20) |
Change in other liabilities | 3,265 | (694) | 981 |
Net cash provided by (Used in) Operating Activities | 159,791 | 197,947 | 130,721 |
INVESTING ACTIVITIES |  |  |  |
Net change in loans | 0 | 0 | 100,000 |
Net change in overnight investments | (4,109) | 940 | 2,162 |
Purchases of marketable equity securities | (1,563) | (333,140) | (26,166) |
Proceeds from sales of marketable equity securities | 29,796 | 352,835 | 56,749 |
Maturities and sales of investment securities | 2,000 | 1,000 | 3,477 |
Net Cash Provided by (Used in) Investing Activities | 26,124 | (400,865) | 136,222 |
FINANCING ACTIVITIES |  |  |  |
Net change in short-term borrowings | 0 | (40,277) | 40,277 |
Repayment of long-term obligations | (20,300) | (33,300) | (3,575) |
Proceeds from Issuance of Long-term Debt | 0 | 0 | 165,000 |
Repurchase of common stock | 0 | (333,755) | (453,123) |
Cash dividends paid | (41,612) | (30,393) | (18,137) |
Net cash used by financing activities | (61,912) | 248,061 | (269,558) |
Net change in cash | 124,003 | 45,143 | (2,615) |
Cash and due from banks at beginning of period | 49,716 | 4,573 | 7,188 |
Cash and due from banks at end of period | 173,719 | 49,716 | 4,573 |
Cash payments for |  |  |  |
Interest | 16,579 | 13,338 | 7,187 |
Income taxes | 810,116 | 106,618 | 78,345 |
Net proceeds from subordinated notes issuance | 0 | 345,849 | 0 |
Net proceeds from preferred stock issuance | $ 0 | $ 339,937 | $ 0 |

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