INCOME TAXES (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
Current expense
Federal									$ 27,980	$ 25,129	$ 28,852
State									14,359	13,672	9,278
Total current expense									42,339	38,801	38,130
Deferred expense (benefit)
Federal									9,080	(3,080)	7,953
State									1,514	(1,417)	1,258
Total deferred expense (benefit)									10,594	(4,497)	9,211
Total expense	$ 14,368	$ 17,036	$ 10,007	$ 11,522	$ 8,258	$ 9,969	$ 9,249	$ 6,828	$ 52,933	$ 34,304	$ 47,341