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Parent Company Financial Information (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 30,718 | $ 27,484 | $ 25,405 | $ 21,259 | $ 26,740 | $ 25,780 | $ 21,946 | $ 24,361 | $ 104,866 | $ 98,827 | $ 81,574
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 5,009 | 4,090 | 2,859
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 145,847 | 134,756 | 137,618
Net cash received in business combinations |  |  |  |  |  |  |  |  | 0 | 0 | 32,255
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash provided by investing activities |  |  |  |  |  |  |  |  | (548,553) | (423,054) | (521,961)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends, Preferred Stock and Preference Stock |  |  |  |  |  |  |  |  | (157) | (137) | (96)
Cash dividends paid |  |  |  |  |  |  |  |  | (88,677) | (77,263) | (49,494)
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  | 0 | 0 | 5,000
Purchase and retirement of common stock |  |  |  |  |  |  |  |  | (1,125) | (906) | (622)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 1,349 | 1,258 | 929
Excess tax benefit from stock-based compensation |  |  |  |  |  |  |  |  | 344 | 0 | 205
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 451,642 | 275,430 | 392,952
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 48,936 | (12,868) | 8,609
Cash and cash equivalents at beginning of period |  |  |  | 175,302 |  |  |  | 188,170 | 175,302 | 188,170 | 179,561
Cash and cash equivalents at end of period | 224,238 |  |  |  | 175,302 |  |  |  | 224,238 | 175,302 | 188,170
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 104,866 | 98,827 | 81,574
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (22,757) | (33,058) | (66,681)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 5,009 | 4,090 | 2,859
Net changes in other assets and liabilities |  |  |  |  |  |  |  |  | (394) | (3,170) | (403)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 86,724 | 66,689 | 17,349
Net cash received in business combinations |  |  |  |  |  |  |  |  | 0 | 0 | 10,277
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash provided by investing activities |  |  |  |  |  |  |  |  | 0 | 0 | 10,277
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends, Preferred Stock and Preference Stock |  |  |  |  |  |  |  |  | (157) | (137) | (96)
Cash dividends paid |  |  |  |  |  |  |  |  | (88,677) | (77,263) | (49,494)
Repayment of long-term subordinated debt |  |  |  |  |  |  |  |  | 0 | (8,248) | (14,636)
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  | 0 | 0 | 5,000
Purchase and retirement of common stock |  |  |  |  |  |  |  |  | (1,125) | (906) | (622)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 1,349 | 1,258 | 929
Excess tax benefit from stock-based compensation |  |  |  |  |  |  |  |  | 344 | 0 | 205
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (88,266) | (85,296) | (58,714)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (1,542) | (18,607) | (31,088)
Cash and cash equivalents at beginning of period |  |  |  | $ 3,989 |  |  |  | $ 22,596 | 3,989 | 22,596 | 53,684
Cash and cash equivalents at end of period | $ 2,447 |  |  |  | $ 3,989 |  |  |  | $ 2,447 | $ 3,989 | $ 22,596

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