Loans Held for Investment (LHFI) and Allowance for Loan Losses, excluding Covered Loans, Part 7 (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Modifications [Line Items]
Nonaccrual	$ 99,578	$ 99,578	$ 142,923
Troubled Debt Restructurings that Subsequently Defaulted [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,039	1,039	318
Nonaccrual	26,684	26,684	18,898
Total Troubled Debt Restructurings by Type	3,792	27,723	19,216
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Construction Land Development And Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Accruing	244	244	0
Nonaccrual	8,203	8,203	3,181
Total Troubled Debt Restructurings by Type	1,843	8,447	3,181
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Residential Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Total Troubled Debt Restructurings by Type	1,949
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Troubled Debt Restructurings by Type		11,531
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Total Troubled Debt Restructurings by Type		8,447
Troubled Debt Restructurings [Member] | Residential Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Accruing	795	795	318
Nonaccrual	2,754	2,754	1,488
Total Troubled Debt Restructurings by Type		3,549	1,806
Troubled Debt Restructurings [Member] | Nonresidential Properties Financing Receivables [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	4,196	4,196	2,232
Total Troubled Debt Restructurings by Type		4,196	2,232
Troubled Debt Restructurings [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	11,531	11,531	11,997
Total Troubled Debt Restructurings by Type		$ 11,531	$ 11,997