DEPOSITS (Deposit Liabilities Activities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deposit Activity [Roll Forward]
Balance at beginning of year	$ 3,475,654	$ 3,591,198	$ 3,865,550
Net increase (decrease) before interest credited	67,043	(141,708)	(326,672)
Interest credited	15,107	26,164	52,320
Net increase (decrease) in deposits	82,150	(115,544)	(274,352)
Balance at end of year	$ 3,557,804	$ 3,475,654	$ 3,591,198