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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract] |
Summary of Balance Sheet of Parent Company | BALANCE SHEETS
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
ASSETS |  |  |  |  |  |  |  |
Cash |  | $ | 67,917 |  |  | $ | 57,537 |
Securities |  |  | 8 |  |  |  | 97 |
Investments in subsidiaries |  |  | 737,205 |  |  |  | 681,861 |
Goodwill |  |  | 450 |  |  |  | 450 |
Dividends receivable |  |  | 7,788 |  |  |  | 6,998 |
Other assets |  |  | 1,393 |  |  |  | 2,610 |
Total assets |  | $ | 814,761 |  |  | $ | 749,553 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |
Other liabilities |  | $ | 7,173 |  |  | $ | 6,500 |
Junior subordinated debentures |  |  | 31,959 |  |  |  | 31,959 |
Stockholders’ equity |  |  | 775,629 |  |  |  | 711,094 |
Total liabilities and stockholders’ equity |  | $ | 814,761 |  |  | $ | 749,553 |
Summary of Income Statement of Parent Company | STATEMENTS OF INCOME
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  | $ | 29,455 |  |  | $ | 28,175 |  |  | $ | 26,043 |
Interest on interest-bearing deposits |  |  | 291 |  |  |  | 160 |  |  |  | 66 |
Other |  |  | 3 |  |  |  | 3 |  |  |  | 2 |
Total operating income |  |  | 29,749 |  |  |  | 28,338 |  |  |  | 26,111 |
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  | 2,122 |  |  |  | 2,096 |  |  |  | 1,998 |
Other |  |  | 770 |  |  |  | 583 |  |  |  | 628 |
Total operating expense |  |  | 2,892 |  |  |  | 2,679 |  |  |  | 2,626 |
Income before taxes and equity in undistributed earnings of subsidiaries |  |  | 26,857 |  |  |  | 25,659 |  |  |  | 23,485 |
Allocated income tax benefit/(expense) |  |  | 3,295 |  |  |  | 1,244 |  |  |  | (796 | )
Income before equity in undistributed earnings of subsidiaries |  |  | 30,152 |  |  |  | 26,903 |  |  |  | 22,689 |
Equity in undistributed earnings of subsidiaries |  |  | 57,429 |  |  |  | 44,172 |  |  |  | 44,653 |
Amortization of stock-based compensation arrangements of subsidiaries |  |  | (1,142 | ) |  |  | (401 | ) |  |  | (1,172 | )
Net income |  | $ | 86,439 |  |  | $ | 70,674 |  |  | $ | 66,170 |
Summary of Cash Flow of Parent Company | STATEMENTS OF CASH FLOW
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 86,439 |  |  | $ | 70,674 |  |  | $ | 66,170 |
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  | (57,429 | ) |  |  | (44,172 | ) |  |  | (44,653 | )
Amortization of stock-based compensation arrangements |  |  | 1,142 |  |  |  | 401 |  |  |  | 1,172 |
Other, net |  |  | 569 |  |  |  | 136 |  |  |  | (343 | )
Net cash provided by operating activities |  |  | 30,721 |  |  |  | 27,039 |  |  |  | 22,346 |
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by acquisitions |  |  | — |  |  |  | — |  |  |  | 5,066 |
Payments for investments in subsidiaries |  |  | (502 | ) |  |  | — |  |  |  | — |
Sales and maturities of held for investment and available for sale securities |  |  | 100 |  |  |  | — |  |  |  | — |
Net cash (used in) provided by investing activities |  |  | (402 | ) |  |  | — |  |  |  | 5,066 |
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | 4,844 |  |  |  | 13,354 |  |  |  | 4,428 |
Common stock acquired |  |  | — |  |  |  | (5,523 | ) |  |  | (1,654 | )
Cash dividends paid |  |  | (24,783 | ) |  |  | (22,770 | ) |  |  | (21,449 | )
Net cash used for financing activities |  |  | (19,939 | ) |  |  | (14,939 | ) |  |  | (18,675 | )
Net increase in cash |  |  | 10,380 |  |  |  | 12,100 |  |  |  | 8,737 |
Cash and due from banks at the beginning of the period |  |  | 57,537 |  |  |  | 45,437 |  |  |  | 36,700 |
Cash and due from banks at the end of the period |  | $ | 67,917 |  |  | $ | 57,537 |  |  | $ | 45,437 |
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  | $ | 2,122 |  |  | $ | 2,096 |  |  | $ | 1,998 |
Cash received during the period for income taxes, net |  | $ | 4,643 |  |  | $ | 5,031 |  |  | $ | 1,131 |

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