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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