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PARENT COMPANY FINANCIALS ONLY (Details 2) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends received from subsidiaries(1) |  |  |  |  |  |  |  |  |  | $ (46,900,000) | $ (44,500,000) |
Net income |  | $ 22,064,000 | $ 23,852,000 | $ 20,563,000 | $ 20,725,000 | $ 17,179,000 | $ 20,484,000 | $ 20,374,000 | $ 18,611,000 | 87,204,000 | 76,648,000 | $ 64,960,000
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense |  |  |  |  |  |  |  |  |  | 9,211,000 | (5,000) | 10,220,000
Change in other assets |  |  |  |  |  |  |  |  |  | 20,022,000 | 7,627,000 | 3,842,000
Change in other liabilities |  |  |  |  |  |  |  |  |  | (3,825,000) | (8,738,000) | (2,450,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 130,909,000 | 93,336,000 | 89,543,000
Cash flows used in investing activities |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (316,769,000) | (238,886,000) | (205,541,000)
Cash flows provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  |  |  |  |  |  |  | (1,422,000) | (696,000) | (657,000)
Cash received from stock option exercises |  |  |  |  |  |  |  |  |  | 214,000 | 201,000 | 1,367,000
Proceeds from shares issued under the direct stock purchase plan |  |  |  |  |  |  |  |  |  | 1,636,000 | 2,323,000 | 2,695,000
Common dividends paid |  |  |  |  |  |  |  |  |  | (34,045,000) | (29,711,000) | (26,172,000)
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | 109,881,000 | 158,880,000 | 213,509,000
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (75,979,000) | 13,330,000 | 97,511,000
Cash and cash equivalents at beginning of year |  |  |  |  | 289,095,000 |  |  |  | 275,765,000 | 289,095,000 | 275,765,000 | 178,254,000
Cash and cash equivalents at end of period |  | 213,116,000 |  |  |  | 289,095,000 |  |  |  | 213,116,000 | 289,095,000 | 275,765,000
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends received from subsidiaries(1) |  |  |  |  |  |  |  |  |  | (67,000) | (62,000) | (55,000)
Investments in subsidiaries |  | 1,000,000,000 |  |  |  | 933,600,000 |  |  |  | 1,000,000,000 | 933,600,000 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries | [1] | 1,010,125,000 |  |  |  | 935,778,000 |  |  |  | 1,010,125,000 | 935,778,000 |
Net income |  |  |  |  |  |  |  |  |  | 87,204,000 | 76,648,000 | 64,960,000
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |
Amortization (accretion) |  |  |  |  |  |  |  |  |  | 12,000 | (154,000) | (150,000)
Deferred income tax expense |  |  |  |  |  |  |  |  |  | 51,000 | 678,000 | 3,266,000
Change in other assets |  |  |  |  |  |  |  |  |  | (99,000) | 423,000 | 7,488,000
Change in other liabilities |  |  |  |  |  |  |  |  |  | (562,000) | (5,532,000) | (254,000)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (42,620,000) | (36,062,000) | (30,226,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 43,986,000 | 36,001,000 | 45,084,000
Cash flows used in investing activities |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net of cash acquired (1) | [2] |  |  |  |  |  |  |  |  | (4,834,000) | (950,000) | (51,680,000)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (4,834,000) | (950,000) | (51,680,000)
Cash flows provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  |  |  |  |  |  |  | (1,422,000) | (696,000) | (657,000)
Cash received from stock option exercises |  |  |  |  |  |  |  |  |  | 214,000 | 201,000 | 1,367,000
Proceeds from shares issued under the direct stock purchase plan |  |  |  |  |  |  |  |  |  | 1,636,000 | 2,323,000 | 2,695,000
Common dividends paid |  |  |  |  |  |  |  |  |  | (34,045,000) | (29,711,000) | (26,172,000)
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | (33,617,000) | (27,883,000) | (22,767,000)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 5,535,000 | 7,168,000 | (29,363,000)
Cash and cash equivalents at beginning of year |  |  |  |  | $ 42,596,000 |  |  |  | $ 35,428,000 | 42,596,000 | 35,428,000 | 64,791,000
Cash and cash equivalents at end of period |  | 48,131,000 |  |  |  | 42,596,000 |  |  |  | 48,131,000 | 42,596,000 | $ 35,428,000
Cash | [3] | $ 48,131,000 |  |  |  | $ 42,596,000 |  |  |  | $ 48,131,000 | $ 42,596,000 |
[1] | $1.0 billion and $933.6 million eliminate in consolidation at December 31, 2017 and 2016, respectively.
[2] | The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2017, 2016, and 2015, respectively.
[3] | Entire balance eliminates in consolidation.

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