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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expense:                      
Interest on long-term debt                 $ 4,556 $ 3,479 $ 3,005
Income tax expense                 18,758 34,596 26,273
Net income $ 15,792 $ 15,193 $ 14,224 $ 14,277 $ 4,288 $ 11,812 $ 12,025 $ 13,079 59,486 41,204 46,992
Parent                      
Income:                      
Dividends from subsidiary bank                 103,001 43,000 29,965
Interest income:                      
Interest income from subsidiary bank                 5 6 6
Other income                 160 150 100
Total income                 103,166 43,156 30,071
Expense:                      
Interest on long-term debt                 4,338 3,479 3,005
Other expenses                 1,617 2,002 2,739
Total expenses                 5,955 5,481 5,744
Income before income taxes and equity in undistributed income of subsidiaries                 97,211 37,675 24,327
Income tax expense                 (1,261) (1,781) (2,467)
Income before equity in undistributed income of subsidiaries                 98,472 39,456 26,794
Equity in undistributed income (loss) of subsidiary bank                 (38,986) 1,748 20,198
Net income                 $ 59,486 $ 41,204 $ 46,992