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Parent Company Financial Statements | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Parent Company Financial Statements | PARENT COMPANY FINANCIAL STATEMENTS
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 |
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 |
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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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96868048&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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