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PARENT COMPANY STATEMENTS, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities [Abstract] |  |  |
Net income | $ 150,717 | $ 103,812 | $ 91,230
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Net change in other assets and other liabilities | 26,090 | (7,614) | (5,681)
Net cash provided by operating activities | 189,674 | 135,771 | 119,566
Investing activities [Abstract] |  |  |
Cash (paid)/received for acquisitions, net of cash acquired of $150,534, $0, and $81,772, respectively | (107,414) | (575) | 25,505
Net cash provided by/(used in) investing activities | 131,371 | (121,998) | (274,161)
Financing activities [Abstract] |  |  |
Issuance of common stock | 4,563 | 10,543 | 9,774
Purchase of treasury stock | (3,306) | (3,470) | (9,126)
Sale of treasury stock | 10,060 | 8,888 | 16,571
Increase in deferred compensation arrangements | 3,306 | 0 | 0
Net cash (used in)/provided by financing activities | (273,864) | 6,874 | 169,409
Change in cash and cash equivalents | 47,181 | 20,647 | 14,814
Cash and cash equivalents at beginning of year | 173,857 | 153,210 | 138,396
Cash and cash equivalents at end of year | 221,038 | 173,857 | 153,210
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 13,705 | 11,268 | 11,252
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 17,460 | 14,268 | 13,605
Common stock issued for acquisition | 343,132 | 0 | 102,202
Cash acquired related to acquisition | 52,132 | 0 | 81,772
Parent Company [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 150,717 | 103,812 | 91,230
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Equity in undistributed net income of subsidiaries | (26,175) | (15,483) | (18,264)
Net change in other assets and other liabilities | 1,870 | (215) | (27)
Net cash provided by operating activities | 126,412 | 88,114 | 72,939
Investing activities [Abstract] |  |  |
Proceeds from sale of investment securities | 0 | 0 | 0
Cash (paid)/received for acquisitions, net of cash acquired of $150,534, $0, and $81,772, respectively | (139,471) | 0 | 25,505
Capital contributions to subsidiaries | (11,063) | 0 | (80,231)
Net cash provided by/(used in) investing activities | (150,534) | 0 | (54,726)
Financing activities [Abstract] |  |  |
Issuance of common stock | 9,700 | 15,326 | 13,975
Purchase of treasury stock | (3,306) | (3,470) | (9,126)
Sale of treasury stock | 10,060 | 8,888 | 16,571
Increase in deferred compensation arrangements | 3,306 | 0 | 0
Cash dividends paid | (62,305) | (55,048) | (49,273)
Net cash (used in)/provided by financing activities | (42,545) | (34,304) | (27,853)
Change in cash and cash equivalents | (66,667) | 53,810 | (9,640)
Cash and cash equivalents at beginning of year | 151,127 | 97,317 | 106,957
Cash and cash equivalents at end of year | 84,460 | 151,127 | 97,317
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 3,826 | 2,909 | 2,523
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 17,460 | 14,268 | 13,605
Capital contributions to subsidiaries | 513,769 | 0 | 76,461
Common stock issued for acquisition | 343,132 | 0 | 102,202
Cash acquired related to acquisition | $ 150,534 | $ 0 | $ 81,772

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