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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expense:                      
Interest on long-term debt                 $ 4,080 $ 4,556 $ 3,479
Income tax expense                 19,605 18,758 34,596
Net income $ 14,197 $ 14,554 $ 13,534 $ 16,037 $ 15,792 $ 15,193 $ 14,224 $ 14,277 58,322 59,486 41,204
Parent                      
Income:                      
Dividends from subsidiary bank                 42,008 103,001 43,000
Interest income:                      
Interest income from subsidiary bank                 5 5 6
Other income                 92 160 150
Total income                 42,105 103,166 43,156
Expense:                      
Interest on long-term debt                 2,453 4,338 3,479
Other expenses                 2,599 1,617 2,002
Total expenses                 5,052 5,955 5,481
Income before income taxes and equity in undistributed income of subsidiaries                 37,053 97,211 37,675
Income tax expense                 (1,289) (1,261) (1,781)
Income before equity in undistributed income of subsidiaries                 38,342 98,472 39,456
Equity in undistributed income (loss) of subsidiary bank                 19,980 (38,986) 1,748
Net income                 $ 58,322 $ 59,486 $ 41,204