CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 29, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed statements of earnings (loss)
Interest expense	$ 4,099	$ 4,352	$ 4,477	$ 6,720	$ 7,140	$ 8,077	$ 8,507	$ 8,919	$ 19,648	$ 32,643	$ 40,957
Earnings (loss) before income taxes and equity in undistributed earnings of subsidiaries	32,468	26,937	25,970	8,121	24,436	22,649	22,001	18,418	93,496	87,504	(108,730)
Income tax (expense) benefit	(12,576)	(10,849)	(10,413)	(2,857)	(10,553)	(9,345)	(9,160)	(7,742)	(36,695)	(36,800)	46,714
NET EARNINGS (LOSS)	19,892	16,088	15,557	5,264	13,883	13,304	12,841	10,676	56,801	50,704	(62,016)
Parent company
Condensed statements of earnings (loss)
Miscellaneous income									114	157	174
Dividends from Bank subsidiary									50,000	25,500
Total income									50,114	25,657	174
Interest expense									3,721	4,923	5,594
Operating expenses									3,979	8,255	9,665
Total expenses									7,700	13,178	15,259
Earnings (loss) before income taxes and equity in undistributed earnings of subsidiaries									42,414	12,479	(15,085)
Income tax (expense) benefit									3,174	5,671	6,356
Earnings (loss) before equity in undistributed earnings (losses) of subsidiaries									45,588	18,150	(8,729)
Equity in undistributed earnings (losses) of subsidiaries									11,213	32,554	(53,287)
NET EARNINGS (LOSS)									$ 56,801	$ 50,704	$ (62,016)