CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed statements of earnings (loss)
Acquisition-related securities gain		$ 5,222							$ 5,222
Dividends from Bank subsidiary									1,604	446	173
Interest expense	2,598	2,869	3,158	3,576	4,099	4,352	4,477	6,720	12,201	19,648	32,643
Earnings before income taxes and equity in undistributed earnings of subsidiaries	12,582	35,383	6,302	21,213	32,468	26,937	25,970	8,121	75,480	93,496	87,504
Income tax (expense) benefit	(9,135)	(11,243)	(1,906)	(7,719)	(12,576)	(10,849)	(10,413)	(2,857)	(30,003)	(36,695)	(36,800)
NET EARNINGS	3,109	24,163	4,349	13,494	19,892	16,088	15,557	5,264	45,115	56,801	50,704
Parent company
Condensed statements of earnings (loss)
Acquisition-related securities gain									5,222
Debt termination income										1,597
Miscellaneous income									104	114	157
Dividends from Bank subsidiary									48,000	50,000	25,500
Total income									53,326	51,711	25,657
Interest expense									3,796	3,721	4,923
Operating expenses									6,061	5,576	8,255
Total expenses									9,857	9,297	13,178
Earnings before income taxes and equity in undistributed earnings of subsidiaries									43,469	42,414	12,479
Income tax (expense) benefit									4,038	3,174	5,671
Earnings before equity in undistributed earnings of subsidiaries									47,507	45,588	18,150
Equity in undistributed earnings of subsidiaries									(2,392)	11,213	32,554
NET EARNINGS									$ 45,115	$ 56,801	$ 50,704