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PARENT COMPANY FINANCIALS ONLY (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Schedule of Condensed Balance Sheets | BALANCE SHEETS
| December 31
| 2017 |  | 2016
| (Dollars in thousands)
Assets |
Cash(1) | $ | 48,131 |  |  | $ | 42,596 |
Investments in subsidiaries(2) | 1,010,125 |  |  | 935,778 |
Prepaid income taxes | 786 |  |  | 625 |
Deferred tax asset | 96 |  |  | 216 |
Derivative instruments(1) | 1,535 |  |  | 1,364 |
Total assets | $ | 1,060,673 |  |  | $ | 980,579 |
Liabilities and stockholders’ equity |  |  |
Dividends payable | $ | 8,786 |  |  | $ | 7,834 |
Junior subordinated debentures | 73,073 |  |  | 73,107 |
Subordinated debentures | 34,682 |  |  | 34,635 |
Other liabilities | 323 |  |  | 313 |
Total liabilities | 116,864 |  |  | 115,889 |
Stockholders’ equity | 943,809 |  |  | 864,690 |
Total liabilities and stockholders’ equity | $ | 1,060,673 |  |  | $ | 980,579 |
(1) | Entire balance eliminates in consolidation.
(2) | $1.0 billion and $933.6 million eliminate in consolidation at December 31, 2017 and 2016, respectively.
Schedule of Condensed Statements of Income | STATEMENTS OF INCOME
| Years Ended December 31
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Income |
Dividends received from subsidiaries(1) | $ | 47,006 |  |  | $ | 44,598 |  |  | $ | 38,153 |
Interest income(2) | 50 |  |  | 98 |  |  | 78 |
Total income | 47,056 |  |  | 44,696 |  |  | 38,231 |
Expenses |  |  |  |  |
Interest expense | 3,995 |  |  | 5,901 |  |  | 5,769 |
Other expenses | — |  |  | — |  |  | 29 |
Total expenses | 3,995 |  |  | 5,901 |  |  | 5,798 |
Income before income taxes and equity in undistributed income of subsidiaries | 43,061 |  |  | 38,795 |  |  | 32,433 |
Income tax benefit | (1,523 | ) |  | (1,791 | ) |  | (2,301 | )
Income of parent company | 44,584 |  |  | 40,586 |  |  | 34,734 |
Equity in undistributed income of subsidiaries | 42,620 |  |  | 36,062 |  |  | 30,226 |
Net income | $ | 87,204 |  |  | $ | 76,648 |  |  | $ | 64,960 |
(1) | Income of $67,000, $62,000 and $55,000 was not eliminated in consolidation for the years ended December 31, 2017, 2016, and 2015, respectively.
(2) | Entire balance eliminated in consolidation.
Schedule of Condensed Statements of Cash Flows | STATEMENTS OF CASH FLOWS
| Years Ended December 31
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Cash flows from operating activities |
Net income | $ | 87,204 |  |  | $ | 76,648 |  |  | $ | 64,960 |
Adjustments to reconcile net income to cash provided by operating activities |  |  |  |  |
Amortization (accretion) | 12 |  |  | (154 | ) |  | (150 | )
Deferred income tax expense | 51 |  |  | 678 |  |  | 3,266 |
Change in other assets | (99 | ) |  | 423 |  |  | 7,488 |
Change in other liabilities | (562 | ) |  | (5,532 | ) |  | (254 | )
Equity in undistributed income of subsidiaries | (42,620 | ) |  | (36,062 | ) |  | (30,226 | )
Net cash provided by operating activities | 43,986 |  |  | 36,001 |  |  | 45,084 |
Cash flows used in investing activities |  |  |  |  |
Cash paid for acquisitions, net of cash acquired (1) | (4,834 | ) |  | (950 | ) |  | (51,680 | )
Net cash used in investing activities | (4,834 | ) |  | (950 | ) |  | (51,680 | )
Cash flows used in financing activities |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (1,422 | ) |  | (696 | ) |  | (657 | )
Net proceeds from exercise of stock options | 214 |  |  | 201 |  |  | 1,367 |
Proceeds from shares issued under the direct stock purchase plan | 1,636 |  |  | 2,323 |  |  | 2,695 |
Common dividends paid | (34,045 | ) |  | (29,711 | ) |  | (26,172 | )
Net cash used in financing activities | (33,617 | ) |  | (27,883 | ) |  | (22,767 | )
Net increase (decrease) in cash and cash equivalents | 5,535 |  |  | 7,168 |  |  | (29,363 | )
Cash and cash equivalents at the beginning of the year | 42,596 |  |  | 35,428 |  |  | 64,791 |
Cash and cash equivalents at the end of the year | $ | 48,131 |  |  | $ | 42,596 |  |  | $ | 35,428 |
(1) | The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2017, 2016, and 2015, respectively.

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