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Parent Company Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets |  |  |  |  |
Overnight investments | $ 797,406 | $ 797,406 | $ 1,387,927 |  |
Investment in marketable equity securities | 92,599 | 92,599 | 0 |  |
Investment securities available for sale | 4,557,110 | 4,557,110 | 7,180,180 |  |
Other assets | 433,595 | 433,595 | 688,594 |  |
Total assets | 35,408,629 | 35,408,629 | 34,527,512 |  |
Liabilities and Shareholders' Equity |  |  |  |  |
Short-term borrowings | 572,287 | 572,287 | 693,807 |  |
Long-term obligations | 319,867 | 319,867 | 870,240 |  |
Other liabilities | 249,443 | 249,443 | 261,784 |  |
Stockholders' equity | 3,488,954 | 3,488,954 | 3,334,064 | $ 3,012,427 | $ 2,872,109
Total liabilities and shareholders' equity | 35,408,629 | 35,408,629 | 34,527,512 |  |
Income Statement [Abstract] |  |  |  |  |
Interest expense |  | 36,857 | 43,794 | 43,082 |
Net interest income (loss) |  | 1,208,900 | 1,059,896 | 944,675 |
Dividends from subsidiaries |  | 242,910 |  |  |
Marketable equity securities losses, net | 9 | 1,190 |  |  |
Income tax benefit |  | 103,297 | 219,946 | 125,585 |
Net income |  | 400,313 | 323,752 | 225,482 |
OPERATING ACTIVITIES |  |  |  |  |
Net income |  | 400,313 | 323,752 | 225,482 |
Net amortization of premiums and accretion of discounts |  | (36,567) | (40,028) | (44,618) |
Change in the fair value of marketable equity securities |  | 7,610 | 0 | 0 |
Gain on elimination of acquired debt |  | (26,553) | (12,483) | 0 |
Securities (gains) losses |  | (351) | (4,293) | (26,673) |
Change in other assets |  | 304,503 | (31,978) | (7,197) |
Change in other liabilities |  | (40,895) | (25,939) | (25,520) |
INVESTING ACTIVITIES |  |  |  |  |
Net change in overnight investments |  | 601,979 | 586,279 | 233,433 |
Purchases of marketable equity securities |  | (2,818) | 0 | 0 |
Proceeds from sales of marketable equity securities |  | 9,528 | 0 | 0 |
FINANCING ACTIVITIES |  |  |  |  |
Repayment of long-term obligations |  | (752,447) | (6,955) | (9,279) |
Repurchase of common stock |  | (163,095) | 0 | 0 |
Cash dividends paid |  | (16,779) | (14,412) | (14,412) |
Net change in cash |  | (8,710) | (203,591) | 5,655 |
Cash and due from banks at beginning of period |  | 336,150 | 539,741 | 534,086 |
Cash and due from banks at end of period | 327,440 | 327,440 | 336,150 | 539,741 |
Cash payments for |  |  |  |  |
Interest |  | 37,097 | 43,639 | 44,998 |
Income taxes |  | 73,806 | 88,565 | 108,741 |
Parent |  |  |  |  |
Assets |  |  |  |  |
Cash | 7,188 | 7,188 | 45,411 |  |
Overnight investments | 385 | 385 | 14,476 |  |
Investment in marketable equity securities | 92,599 | 92,599 | 0 |  |
Investment securities available for sale | 6,456 | 6,456 | 117,513 |  |
Investment in Banking Subsidiaries | 3,314,292 | 3,314,292 | 3,203,491 |  |
Investment in Other Subsidiaries | 41,830 | 41,830 | 41,165 |  |
Due from subsidiaries | 814 | 814 | 4 |  |
Note to banking subsidiaries | 100,000 | 100,000 | 0 |  |
Other assets | 42,810 | 42,810 | 46,674 |  |
Total assets | 3,606,374 | 3,606,374 | 3,468,734 |  |
Liabilities and Shareholders' Equity |  |  |  |  |
Short-term borrowings | 0 | 0 | 15,000 |  |
Long-term obligations | 105,546 | 105,546 | 107,479 |  |
Due to Affiliate | 299 | 299 | 728 |  |
Other liabilities | 11,575 | 11,575 | 11,463 |  |
Stockholders' equity | 3,488,954 | 3,488,954 | 3,334,064 |  |
Total liabilities and shareholders' equity | 3,606,374 | 3,606,374 | 3,468,734 |  |
Income Statement [Abstract] |  |  |  |  |
Interest income |  | 1,362 | 921 | 1,110 |
Interest expense |  | 5,154 | 4,814 | 6,067 |
Net interest income (loss) |  | (3,792) | (3,893) | (4,957) |
Dividends from subsidiaries |  |  | 50,424 | 90,100 |
Dividend Income, Banking Subsidiaries |  |  |  | 90,055 |
Marketable equity securities losses, net |  | (7,610) | 0 | 0 |
Other income (loss) |  | 347 | 8,437 | 9,330 |
Other operating expense |  | 11,127 | 6,881 | 5,641 |
Income tax benefit |  | (5,184) | (5,395) | (730) |
Income before income tax benefit and equity in undistributed net income of subsidiaries |  | 220,728 | 48,087 | 88,787 |
Excess distributions (undistributed ) net income of subsidiaries |  | (174,401) | (270,270) | (135,965) |
Net income |  | 400,313 | 323,752 | 225,482 |
Income before equity in undistributed net income of subsidiaries |  | 225,912 | 53,482 | 89,517 |
OPERATING ACTIVITIES |  |  |  |  |
Net income |  | 400,313 | 323,752 | 225,482 |
Excess distributions (undistributed ) net income of subsidiaries |  | (174,401) | (270,270) | (135,965) |
Net amortization of premiums and accretion of discounts |  | 88 | 759 | 398 |
Gain on elimination of acquired debt |  | (160) | (919) | (1,717) |
Securities (gains) losses |  | 0 | (8,003) | (9,446) |
Change in other assets |  | 3,657 | (10,509) | (980) |
Change in other liabilities |  | (2,595) | 6,310 | 2,483 |
Net cash provided by (Used in) Operating Activities |  | 234,512 | 41,120 | 80,255 |
INVESTING ACTIVITIES |  |  |  |  |
Net change in loans |  | (100,000) | 0 | 0 |
Net change in due from subsidiaries |  | (810) | (4) | 0 |
Net change in overnight investments |  | 14,091 | 11,681 | (24,741) |
Purchases of marketable equity securities |  | (2,818) | 0 | 0 |
Proceeds from sales of marketable equity securities |  | 9,528 |  |  |
Purchases of investment securities |  | (6,438) | (28,012) | (93,003) |
Maturities and sales of investment securities |  | 9,997 | 32,463 | 38,316 |
Net Cash Provided by (Used in) Investing Activities |  | (76,450) | 16,128 | (79,428) |
FINANCING ACTIVITIES |  |  |  |  |
Change in Due to Subsidiaries |  | 429 | (1,622) | 2,296 |
Net change in short-term borrowings |  | (15,000) | 0 | 0 |
Repayment of long-term obligations |  | (1,840) | (4,081) | (5,302) |
Repurchase of common stock |  | (163,095) | 0 | 0 |
Cash dividends paid |  | (16,779) | (14,412) | (14,412) |
Net cash used by financing activities |  | (196,285) | (20,115) | (17,418) |
Net change in cash |  | (38,223) | 37,133 | (16,591) |
Cash and due from banks at beginning of period |  | 45,411 | 8,278 | 24,869 |
Cash and due from banks at end of period | $ 7,188 | 7,188 | 45,411 | 8,278 |
Cash payments for |  |  |  |  |
Interest |  | 5,154 | 4,814 | 4,006 |
Income taxes |  | $ 73,806 | $ 88,565 | $ 108,741 |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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