FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fdic Indemnification Asset Details
Receivable related to claims submitted, not yet received	$ 33,040	$ 13,377
Receivable related to estimated future claims on loans	62,044	90,275
Receivable related to estimated future claims on other real estate owned	7,475	18,025
FDIC indemnification asset	$ 102,559	$ 121,677	$ 123,719	$ 143,221

Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

No definition available.

Name:	us-gaap_FDICIndemnificationAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant