FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fdic Indemnification Asset Details
Receivable related to claims submitted, not yet received	$ 18,574	$ 13,377	$ 27,668
Receivable related to estimated future claims on loans	79,308	90,275	100,953
Receivable related to estimated future claims on other real estate owned	19,020	18,025	14,273
FDIC indemnification asset	$ 116,902	$ 121,677	$ 142,894

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