CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 13,249	$ 16,987	$ 25,383	$ 27,537
OTHER COMPREHENSIVE INCOME, NET OF INCOME TAXES:
Unrealized holding gain (loss) on available-for-sale securities arising during the period	(1,400)	2,330	883	4,836
Income tax benefit (expense) related to available-for-sale securities unrealized holding gain (loss)	504	(845)	(318)	(1,747)
Reclassification for net gains on available-for-sale securities realized in earnings	(21)	0	(125)	(34)
Income tax benefit related to available-for-sale securities realized gains	8	0	45	12
Other comprehensive income (loss)	(909)	1,485	485	3,067
COMPREHENSIVE INCOME	$ 12,340	$ 18,472	$ 25,868	$ 30,604