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PARENT COMPANY AND REGULATORY RESTRICTIONS (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 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
Expense:                      
Interest on long-term debt                 $ 3,479 $ 3,005 $ 2,626
Income tax expense                 33,852 25,228 27,088
Net income $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 12,208 $ 11,466 $ 12,137 $ 11,181 41,204 46,992 45,868
Parent                      
Income:                      
Dividends from subsidiary bank                 43,000 29,965 111,765
Interest income:                      
Interest from subsidiary bank                 6 6 9
Other income                 150 100 91
Total income                 43,156 30,071 111,865
Expense:                      
Interest on long-term debt                 3,479 3,005 2,626
Other expenses                 2,002 2,739 2,551
Total expenses                 5,481 5,744 5,177
Gain (loss) before income taxes and equity in undistributed income of subsidiaries                 37,675 24,327 106,688
Income tax expense                 (1,781) (2,467) 670
Income before equity in undistributed income of subsidiaries                 39,456 26,794 106,018
Equity in undistributed income (loss) of subsidiary bank                 1,748 20,198 (60,150)
Net income                 $ 41,204 $ 46,992 $ 45,868