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Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Balance Sheets |
Parent Company
Condensed Balance Sheets
(Dollars in thousands) | December 31, 2017 |  | December 31, 2016
Assets |  |  |
Cash | $ | 45,411 |  |  | $ | 8,278 |
Overnight investments | 14,476 |  |  | 26,157 |
Investment securities available for sale | 117,513 |  |  | 95,564 |
Investment in banking subsidiaries | 3,203,491 |  |  | 2,932,048 |
Investment in other subsidiaries | 41,165 |  |  | 41,066 |
Due from subsidiaries | 4 |  |  | — |
Other assets | 46,674 |  |  | 43,077 |
Total assets | $ | 3,468,734 |  |  | $ | 3,146,190 |
Liabilities and Shareholders' Equity |  |  |
Short-term borrowings | $ | 15,000 |  |  | $ | — |
Long-term obligations | 107,479 |  |  | 126,861 |
Due to subsidiaries | 728 |  |  | 2,350 |
Other liabilities | 11,463 |  |  | 4,552 |
Shareholders' equity | 3,334,064 |  |  | 3,012,427 |
Total liabilities and shareholders' equity | $ | 3,468,734 |  |  | $ | 3,146,190 |
Condensed Income Statements |
Parent Company
Condensed Income Statements
| Year ended December 31
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Interest income | $ | 921 |  |  | $ | 1,110 |  |  | $ | 645 |
Interest expense | 4,814 |  |  | 6,067 |  |  | 6,793 |
Net interest loss | (3,893 | ) |  | (4,957 | ) |  | (6,148 | )
Dividends from banking subsidiaries | 50,424 |  |  | 90,055 |  |  | 75,006 |
Dividends from other subsidiaries | — |  |  | — |  |  | 23,500 |
Other income | 8,377 |  |  | 9,330 |  |  | 1,870 |
Other operating expense | 6,821 |  |  | 5,641 |  |  | 2,634 |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 48,087 |  |  | 88,787 |  |  | 91,594 |
Income tax benefit | (5,395 | ) |  | (730 | ) |  | (2,618 | )
Income before equity in undistributed net income of subsidiaries | 53,482 |  |  | 89,517 |  |  | 94,212 |
Equity in undistributed net income of subsidiaries | 270,270 |  |  | 135,965 |  |  | 116,174 |
Net income | $ | 323,752 |  |  | $ | 225,482 |  |  | $ | 210,386 |
Condensed Statements of Cash Flows |
Parent Company
Condensed Statements of Cash Flows
| Year ended December 31
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
OPERATING ACTIVITIES |  |  |  |  |
Net income | $ | 323,752 |  |  | $ | 225,482 |  |  | $ | 210,386 |
Adjustments |  |  |  |  |
Undistributed net income of subsidiaries | (270,270 | ) |  | (135,965 | ) |  | (116,174 | )
Net amortization of premiums and discounts | 759 |  |  | 398 |  |  | (2,712 | )
Gain on extinguishment of long-term obligations | (919 | ) |  | (1,717 | ) |  | — |
Securities gains | (8,003 | ) |  | (9,446 | ) |  | (236 | )
Change in other assets | (10,509 | ) |  | (980 | ) |  | 22,663 |
Change in other liabilities | 2,707 |  |  | 2,483 |  |  | (1,157 | )
Net cash provided by operating activities | 37,517 |  |  | 80,255 |  |  | 112,770 |
INVESTING ACTIVITIES |  |  |  |  |
Net change in due from subsidiaries | (4 | ) |  | — |  |  | 299,889 |
Net change in overnight investments | 11,681 |  |  | (24,741 | ) |  | (1,416 | )
Purchases of investment securities | (28,012 | ) |  | (93,003 | ) |  | (7,818 | )
Proceeds from sales, calls, and maturities of securities | 32,463 |  |  | 38,316 |  |  | 100,586 |
Net cash provided (used) by investing activities | 16,128 |  |  | (79,428 | ) |  | 391,241 |
FINANCING ACTIVITIES |  |  |  |  |
Net change in due to subsidiaries | (1,622 | ) |  | 2,296 |  |  | 54 |
Net change in short-term borrowings | — |  |  | — |  |  | (485,207 | )
Repayment of long-term obligations | (4,081 | ) |  | (5,302 | ) |  | — |
Cash dividends paid | (10,809 | ) |  | (14,412 | ) |  | (18,015 | )
Net cash provided (used) by financing activities | (16,512 | ) |  | (17,418 | ) |  | (503,168 | )
Net change in cash | 37,133 |  |  | (16,591 | ) |  | 843 |
Cash balance at beginning of year | 8,278 |  |  | 24,869 |  |  | 24,026 |
Cash balance at end of year | $ | 45,411 |  |  | $ | 8,278 |  |  | $ | 24,869 |

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