SEGMENT REPORTING (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Reconciliation of assets from segment to consolidated
Total assets	$ 8,573,511	$ 8,358,879
Credit
Reconciliation of assets from segment to consolidated
Total assets	8,106,181	7,904,116
Natural Resources
Reconciliation of assets from segment to consolidated
Total assets	383,097	399,225
Other
Reconciliation of assets from segment to consolidated
Total assets	82,784	53,742
Reconciling Items
Reconciliation of assets from segment to consolidated
Total assets	$ 1,449	$ 1,796