Loans and Asset Quality Information (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
ASSET QUALITY DATA
Nonaccrual loans	$ 87,944		$ 66,525
Foreclosed real estate - non-covered	15,098		26,285		38,065
Foreclosed real estate - covered	29,193		47,290		58,367
Total nonperforming assets	166,428		202,351		259,931
Non-covered nonperforming Assets
ASSET QUALITY DATA
Nonaccrual loans	40,711		33,034		69,413
Restructured loans - accruing	27,656		24,848		38,522
Accruing loans > 90 days past due
Total nonperforming loans	68,367		57,882		107,935
Nonperforming loans held for sale			21,938
Foreclosed real estate - non-covered	15,098		26,285		38,065
Total nonperforming assets	83,465		106,105		146,000
Covered nonperforming Assets
ASSET QUALITY DATA
Nonaccrual loans	47,233	[1]	33,491	[1]	37,619	[1]
Restructured loans - accruing	6,537		15,465		17,945
Accruing loans > 90 days past due
Total nonperforming loans	53,770		48,956		55,564
Foreclosed real estate - covered	29,193		47,290		58,367
Total nonperforming assets	$ 82,963		$ 96,246		$ 113,931

[1] At September 30, 2013, December 31, 2012, and September 30, 2012, the contractual balance of the nonaccrual loans covered by FDIC loss share agreements was $75.5 million, $64.4 million, and $67.9 million, respectively.