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Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Balance Sheets |
Parent Company
Condensed Balance Sheets
(Dollars in thousands) | December 31, 2016 |  | December 31, 2015
Assets |  |  |
Cash | $ | 8,278 |  |  | $ | 24,869 |
Overnight investments | 26,157 |  |  | 1,416 |
Investment securities available for sale | 95,564 |  |  | 21,137 |
Investment in banking subsidiaries | 2,932,048 |  |  | 2,874,581 |
Investment in other subsidiaries | 41,066 |  |  | 43,117 |
Other assets | 92,787 |  |  | 73,944 |
Total assets | $ | 3,195,900 |  |  | $ | 3,039,064 |
Liabilities and Shareholders' Equity |  |  |
Long-term obligations | $ | 126,861 |  |  | $ | 133,775 |
Due to subsidiaries | 56,323 |  |  | 29,682 |
Other liabilities | 289 |  |  | 3,498 |
Shareholders' equity | 3,012,427 |  |  | 2,872,109 |
Total liabilities and shareholders' equity | $ | 3,195,900 |  |  | $ | 3,039,064 |
Condensed Income Statements |
Parent Company
Condensed Income Statements
| Year ended December 31
(Dollars in thousands) | 2016 |  | 2015 |  | 2014
Interest income | $ | 1,110 |  |  | $ | 645 |  |  | $ | 1,784 |
Interest expense | 6,067 |  |  | 6,793 |  |  | 9,694 |
Net interest loss | (4,957 | ) |  | (6,148 | ) |  | (7,910 | )
Dividends from banking subsidiaries | 90,055 |  |  | 75,006 |  |  | 82,419 |
Dividends from other subsidiaries | — |  |  | 23,500 |  |  | — |
Other income | 9,330 |  |  | 1,870 |  |  | 33,600 |
Other operating expense | 5,641 |  |  | 2,634 |  |  | 6,534 |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 88,787 |  |  | 91,594 |  |  | 101,575 |
Income tax benefit | (730 | ) |  | (2,618 | ) |  | (2,590 | )
Income before equity in undistributed net income of subsidiaries | 89,517 |  |  | 94,212 |  |  | 104,165 |
Equity in undistributed net income of subsidiaries | 135,965 |  |  | 116,174 |  |  | 34,397 |
Net income | $ | 225,482 |  |  | $ | 210,386 |  |  | $ | 138,562 |
Condensed Statements of Cash Flows |
Parent Company
Condensed Statements of Cash Flows
| Year ended December 31
(Dollars in thousands) | 2016 |  | 2015 |  | 2014
OPERATING ACTIVITIES |  |  |  |  |
Net income | $ | 225,482 |  |  | $ | 210,386 |  |  | $ | 138,562 |
Adjustments |  |  |  |  |
Undistributed net income of subsidiaries | (135,965 | ) |  | (116,174 | ) |  | (34,397 | )
Net amortization of premiums and discounts | (6,838 | ) |  | (2,712 | ) |  | 594 |
Securities gains | (9,446 | ) |  | (236 | ) |  | (29,126 | )
Gain on elimination of acquired debt | — |  |  | — |  |  | (1,988 | )
Change in other assets | (20,845 | ) |  | (3,070 | ) |  | 93,385 |
Change in other liabilities | (1,780 | ) |  | (1,157 | ) |  | 2,250 |
Net cash provided by operating activities | 50,608 |  |  | 87,037 |  |  | 169,280 |
INVESTING ACTIVITIES |  |  |  |  |
Net change in due from subsidiaries | — |  |  | 295,994 |  |  | (150,328 | )
Net change in overnight investments | (24,741 | ) |  | (1,416 | ) |  | — |
Purchases of investment securities | (93,003 | ) |  | (7,818 | ) |  | (33,243 | )
Proceeds from sales, calls, and maturities of securities | 38,316 |  |  | 100,586 |  |  | 114,208 |
Investment in subsidiaries | — |  |  | — |  |  | 1,579 |
Business acquisitions, net of cash acquired | — |  |  | — |  |  | (24,772 | )
Net cash (used) provided by investing activities | (79,428 | ) |  | 387,346 |  |  | (92,556 | )
FINANCING ACTIVITIES |  |  |  |  |
Net change in due to subsidiaries | 26,641 |  |  | 29,682 |  |  | — |
Net change in short-term borrowings | — |  |  | (485,207 | ) |  | (1,211 | )
Retirement of long-term obligations | — |  |  | — |  |  | (52,372 | )
Stock issuance costs | — |  |  | — |  |  | (619 | )
Cash dividends paid | (14,412 | ) |  | (18,015 | ) |  | (11,543 | )
Net cash provided (used) by financing activities | 12,229 |  |  | (473,540 | ) |  | (65,745 | )
Net change in cash | (16,591 | ) |  | 843 |  |  | 10,979 |
Cash balance at beginning of year | 24,869 |  |  | 24,026 |  |  | 13,047 |
Cash balance at end of year | $ | 8,278 |  |  | $ | 24,869 |  |  | $ | 24,026 |

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