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Parent Company Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
OPERATING ACTIVITIES |  |  |
Net Income | $ 72,968 | $ 71,392 | $ 67,081
Tax benefit from stock-based compensation | 0 | (9) | (53)
Net Cash Provided by Operating Activities | 114,236 | 96,796 | 60,584
INVESTING ACTIVITIES |  |  |
Net Cash Used in Investing Activities | (212,415) | (616,653) | (405,737)
FINANCING ACTIVITIES |  |  |
(Purchase) Sale of treasury shares, net | (689) | (115) | (182)
Cash dividends paid to common shareholders | (28,569) | (26,784) | (24,487)
Tax benefit from stock-based compensation | 0 | 9 | 53
Net Cash Provided by Financing Activities | 75,845 | 559,944 | 334,972
Net increase (decrease) in cash | (22,334) | 40,087 | (10,181)
Cash and cash equivalents at beginning of year | 139,486 | 99,399 | 109,580
Cash and Cash Equivalents at End of Year | 117,152 | 139,486 | 99,399
Parent Company |  |  |
OPERATING ACTIVITIES |  |  |
Net Income | 72,968 | 71,392 | 67,081
Equity in undistributed (earnings) losses of subsidiaries | (39,937) | (40,410) | 5,440
Tax benefit from stock-based compensation | 0 | (9) | (53)
Other | 480 | 379 | 3,129
Net Cash Provided by Operating Activities | 33,511 | 31,352 | 75,597
INVESTING ACTIVITIES |  |  |
Net investments in subsidiaries | 0 | 0 | (38,404)
Acquisitions | 0 | 0 | (29,510)
Net Cash Used in Investing Activities | 0 | 0 | (67,914)
FINANCING ACTIVITIES |  |  |
Repayment of junior subordinated debt | 0 | 0 | (8,500)
(Purchase) Sale of treasury shares, net | (689) | (115) | (182)
Cash dividends paid to common shareholders | (28,569) | (26,784) | (24,487)
Tax benefit from stock-based compensation | 0 | 9 | 53
Net Cash Provided by Financing Activities | (29,258) | (26,890) | (33,116)
Net increase (decrease) in cash | 4,253 | 4,462 | (25,433)
Cash and cash equivalents at beginning of year | 17,057 | 12,595 | 38,028
Cash and Cash Equivalents at End of Year | $ 21,310 | $ 17,057 | $ 12,595

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