ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gains (loss) on available-for-sales securities:
Gain on sale of securities		$ 409		$ 409
Income tax expense	(1,906)	(7,719)	(10,413)	(9,625)	(13,270)
Net earnings	4,349	13,494	15,557	17,843	20,821
Unrealized gains (losses) on available-for-sale securities | Amount reclassified from accumulated other comprehensive income
Unrealized gains (loss) on available-for-sales securities:
Gain on sale of securities				409
Income tax expense				(172)
Net earnings				$ 237