ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification adjustments from accumulated other comprehensive income
Gain on sale of securities				$ 409
Acquisition-related securities gain	5,222			5,222
Total before tax	35,383	6,302	26,937	62,898	61,028
Income tax expense	(11,243)	(1,906)	(10,849)	(20,868)	(24,119)
Net earnings	24,163	4,349	16,088	42,006	36,909
Unrealized gains (losses) on available-for-sale securities | Amount Reclassified from AOCI
Reclassification adjustments from accumulated other comprehensive income
Gain on sale of securities				409
Acquisition-related securities gain				5,222
Total before tax				5,631
Income tax expense				(172)
Net earnings				$ 5,459