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PARENT COMPANY STATEMENTS, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities [Abstract] |  |  |
Net income | $ 103,812 | $ 91,230 | $ 91,353
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Net change in other assets and other liabilities | (12,124) | (8,784) | (970)
Net cash provided by operating activities | 131,261 | 116,463 | 122,104
Investing activities [Abstract] |  |  |
Cash received for acquisitions, net of cash acquired of $0, $81,772, and $0, respectively | (575) | 25,505 | (924)
Net cash (used in) provided by investing activities | (121,998) | (274,161) | (331,132)
Financing activities [Abstract] |  |  |
Issuance of common stock | 10,543 | 9,774 | 9,417
Purchases of treasury stock | (3,470) | (9,126) | (4,368)
Sale of treasury stock | 8,888 | 16,571 | 1,531
Net cash provided by (used in) financing activities | 11,384 | 172,512 | 197,777
Change in cash and cash equivalents | 20,647 | 14,814 | (11,251)
Cash and cash equivalents at beginning of year | 153,210 | 138,396 | 149,647
Cash and cash equivalents at end of year | 173,857 | 153,210 | 138,396
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 11,268 | 11,252 | 11,937
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 14,268 | 13,605 | 12,254
Common stock issued for acquisition | 0 | 102,202 | 0
Cash acquired related to acquisition | 0 | 81,772 | 0
Parent Company [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 103,812 | 91,230 | 91,353
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Equity in undistributed net income of subsidiaries | (15,483) | (18,264) | (32,098)
Net change in other assets and other liabilities | (215) | (27) | (479)
Net cash provided by operating activities | 88,114 | 72,939 | 58,776
Investing activities [Abstract] |  |  |
Proceeds from sale of investment securities | 0 | 0 | 3
Cash received for acquisitions, net of cash acquired of $0, $81,772, and $0, respectively | 0 | 25,505 | 0
Capital contributions to subsidiaries | 0 | (80,231) | 0
Net cash (used in) provided by investing activities | 0 | (54,726) | 3
Financing activities [Abstract] |  |  |
Issuance of common stock | 15,326 | 13,975 | 13,410
Purchases of treasury stock | (3,470) | (9,126) | (4,368)
Sale of treasury stock | 8,888 | 16,571 | 1,531
Cash dividends paid | (55,048) | (49,273) | (46,178)
Net cash provided by (used in) financing activities | (34,304) | (27,853) | (35,605)
Change in cash and cash equivalents | 53,810 | (9,640) | 23,174
Cash and cash equivalents at beginning of year | 97,317 | 106,957 | 83,783
Cash and cash equivalents at end of year | 151,127 | 97,317 | 106,957
Supplemental disclosures of cash flow information [Abstract] |  |  |
Cash paid for interest | 2,909 | 2,523 | 2,473
Supplemental disclosures of noncash financing activities [Abstract] |  |  |
Dividends declared and unpaid | 14,268 | 13,605 | 12,254
Capital contributions to subsidiaries | 0 | 76,461 | 0
Common stock issued for acquisition | 0 | 102,202 | 0
Cash acquired related to acquisition | $ 0 | $ 81,772 | $ 0

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