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PARENT COMPANY STATEMENTS, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 18, 2019 | Jul. 12, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities [Abstract] |  |  |  |  |
Net income |  |  | $ 169,063 | $ 168,641 | $ 150,717
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |
Net change in other assets and other liabilities |  |  | 2,545 | 10,252 | 26,090
Net cash provided by operating activities |  |  | 202,502 | 221,408 | 189,674
Investing activities [Abstract] |  |  |  |  |
Cash paid for acquisitions, net of cash acquired of $1,328, $0, and $150,534, respectively | $ (500) | $ (95,034) | (4,653) | (1,737) | (107,414)
Net cash (used in)/provided by investing activities |  |  | (157,054) | 17,495 | 131,371
Financing activities [Abstract] |  |  |  |  |
Issuance of common stock |  |  | 6,915 | 6,443 | 4,563
Purchase of treasury stock |  |  | (286) | (298) | (3,306)
Sale of treasury stock |  |  | 6,884 | 12,561 | 10,060
Increase in deferred compensation arrangements |  |  | 286 | 298 | 3,306
Net cash used in financing activities |  |  | (52,252) | (248,107) | (273,864)
Change in cash and cash equivalents |  |  | (6,804) | (9,204) | 47,181
Cash and cash equivalents at beginning of year |  |  | 211,834 | 221,038 | 173,857
Cash and cash equivalents at end of year |  |  | 205,030 | 211,834 | 221,038
Supplemental disclosures of cash flow information [Abstract] |  |  |  |  |
Cash paid for interest |  |  | 25,425 | 17,926 | 13,705
Supplemental disclosures of noncash financing activities [Abstract] |  |  |  |  |
Dividends declared and unpaid |  |  | 21,342 | 19,808 | 17,460
Common stock issued for acquisition |  |  | 0 | 0 | 343,132
Cash acquired from acquisition |  |  | 90,381 | 16 | 52,132
Parent Company [Member] |  |  |  |  |
Operating activities [Abstract] |  |  |  |  |
Net income |  |  | 169,063 | 168,641 | 150,717
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |
Equity in undistributed net income of subsidiaries |  |  | (27,753) | (65,026) | (26,175)
Net change in other assets and other liabilities |  |  | 86 | (1,084) | 1,870
Net cash provided by operating activities |  |  | 141,396 | 102,531 | 126,412
Investing activities [Abstract] |  |  |  |  |
Proceeds from redemption of investment securities |  |  | 0 | 776 | 0
Cash paid for acquisitions, net of cash acquired of $1,328, $0, and $150,534, respectively |  |  | (92,056) | 0 | (139,471)
Return of capital from/(capital contributions to) |  |  | 100,680 | 0 | (11,063)
Net cash (used in)/provided by investing activities |  |  | 8,624 | 776 | (150,534)
Financing activities [Abstract] |  |  |  |  |
Repayment of advances from subsidiaries |  |  | (1,652) | 0 | 0
Repayment of borrowings |  |  | (22,681) | (25,207) | 0
Issuance of common stock |  |  | 12,200 | 12,507 | 9,700
Purchase of treasury stock |  |  | (286) | (298) | (3,306)
Sale of treasury stock |  |  | 6,884 | 12,561 | 10,060
Increase in deferred compensation arrangements |  |  | 286 | 298 | 3,306
Cash dividends paid |  |  | (80,241) | (71,495) | (62,305)
Net cash used in financing activities |  |  | (85,490) | (71,634) | (42,545)
Change in cash and cash equivalents |  |  | 64,530 | 31,673 | (66,667)
Cash and cash equivalents at beginning of year |  |  | 116,133 | 84,460 | 151,127
Cash and cash equivalents at end of year |  |  | 180,663 | 116,133 | 84,460
Supplemental disclosures of cash flow information [Abstract] |  |  |  |  |
Cash paid for interest |  |  | 4,306 | 4,857 | 3,826
Supplemental disclosures of noncash financing activities [Abstract] |  |  |  |  |
Dividends declared and unpaid |  |  | 21,342 | 19,808 | 17,460
Advances from subsidiaries |  |  | 1,691 | 0 | 0
Capital contributions to subsidiaries |  |  | 0 | 0 | 513,769
Common stock issued for acquisition |  |  | 0 | 0 | 343,132
Cash acquired from acquisition |  |  | $ 1,328 | $ 0 | $ 150,534

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