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PARENT COMPANY STATEMENTS, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating activities [Abstract] |  |  |
Net income | $ 91,230 | $ 91,353 | $ 78,829
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Net change in other assets and other liabilities | 8,784 | (127) | 11,762
Net cash provided by operating activities | 116,463 | 123,201 | 103,184
Investing activities [Abstract] |  |  |
Cash received for acquisitions, net of cash acquired of $81,772, $0, and $0, respectively | 25,505 | (924) | 291,980
Net cash (used in)/provided by investing activities | (274,161) | (332,229) | 553,258
Financing activities [Abstract] |  |  |
Issuance of common stock | 9,774 | 9,417 | 15,239
Purchase of treasury stock | (9,126) | (4,368) | 0
Sale of treasury stock | 16,571 | 1,531 | 0
Net cash provided by/(used in) financing activities | 172,512 | 197,777 | (735,353)
Change in cash and cash equivalents | 14,814 | (11,251) | (78,911)
Cash and cash equivalents at beginning of year | 138,396 | 149,647 | 228,558
Cash and cash equivalents at end of year | 153,210 | 138,396 | 149,647
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 11,252 | 11,937 | 30,141
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 13,605 | 12,254 | 11,332
Common stock issued for acquisition | 102,201 | 0 | 0
Cash acquired related to acquisition | 81,772 | 0 | 0
Parent Company [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 91,230 | 91,353 | 78,829
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
(Gain)/loss on sale of investments | 0 | 0 | (9)
Equity in undistributed net income of subsidiaries | (18,264) | (32,098) | (14,448)
Net change in other assets and other liabilities | (27) | (479) | (221)
Net cash provided by operating activities | 72,939 | 58,776 | 64,151
Investing activities [Abstract] |  |  |
Proceeds from sale of investment securities | 0 | 3 | 114
Cash received for acquisitions, net of cash acquired of $81,772, $0, and $0, respectively | 25,505 | 0 | 0
Capital contributions to subsidiaries | (80,231) | 0 | 0
Net cash (used in)/provided by investing activities | (54,726) | 3 | 114
Financing activities [Abstract] |  |  |
Issuance of common stock | 13,975 | 13,410 | 19,200
Purchase of treasury stock | (9,126) | (4,368) | 0
Sale of treasury stock | 16,571 | 1,531 | 0
Cash dividends paid | (49,273) | (46,178) | (43,482)
Net cash provided by/(used in) financing activities | (27,853) | (35,605) | (24,282)
Change in cash and cash equivalents | (9,640) | 23,174 | 39,983
Cash and cash equivalents at beginning of year | 106,957 | 83,783 | 43,800
Cash and cash equivalents at end of year | 97,317 | 106,957 | 83,783
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 2,523 | 2,473 | 2,521
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 13,605 | 12,254 | 11,332
Capital contributions to subsidiaries | 76,461 | 0 | 0
Common stock issued for acquisition | 102,202 | 0 | 0
Cash acquired related to acquisition | $ 81,772 | $ 0 | $ 0

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