Loans Held for Investment (LHFI) and Allowance for Loan Losses, excluding Covered Loans Part 4 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	$ 93,510	$ 103,662	$ 94,922
Charge-offs	(45,769)	(71,897)	(80,711)
Recoveries	12,073	12,199	12,339
Net charge-offs	(33,696)	(59,698)	(68,372)
Provisions For Loan Losses	29,704	49,546	77,112
Allowance For Loan Losses	89,518	93,510	103,662
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	12,664	11,797
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	76,854	81,713
Allowance For Loan Losses	89,518	93,510	103,662
Real Estate Secured Financing Receivable [Member] | Construction, Land Development And Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	35,562	43,551
Charge-offs	(16,399)	(31,135)
Recoveries	0	0
Provisions For Loan Losses	8,057	23,146
Allowance For Loan Losses	27,220	35,562
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	6,547	6,782
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	20,673	28,780
Allowance For Loan Losses	27,220	35,562
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	13,051	13,151
Charge-offs	(9,271)	(11,375)
Recoveries	447	417
Provisions For Loan Losses	8,423	10,858
Allowance For Loan Losses	12,650	13,051
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	1,348	1,745
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	11,302	11,306
Allowance For Loan Losses	12,650	13,051
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	20,980	20,110
Charge-offs	(3,896)	(6,520)
Recoveries	0	0
Provisions For Loan Losses	7,274	7,390
Allowance For Loan Losses	24,358	20,980
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	2,431	1,579
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	21,927	19,401
Allowance For Loan Losses	24,358	20,980
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	1,582	1,631
Charge-offs	(1,082)	(1,365)
Recoveries	0	0
Provisions For Loan Losses	2,579	1,316
Allowance For Loan Losses	3,079	1,582
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	1,007	96
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	2,072	1,486
Allowance For Loan Losses	3,079	1,582
Commercial And Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	14,775	16,275
Charge-offs	(4,299)	(4,186)
Recoveries	2,703	2,245
Provisions For Loan Losses	2,689	441
Allowance For Loan Losses	15,868	14,775
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	1,137	1,514
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	14,731	13,261
Allowance For Loan Losses	15,868	14,775
Consumer Loans Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	5,400	7,246
Charge-offs	(5,629)	(10,234)
Recoveries	5,749	6,395
Provisions For Loan Losses	1,864	1,993
Allowance For Loan Losses	3,656	5,400
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	9	23
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	3,647	5,377
Allowance For Loan Losses	3,656	5,400
Other Loans Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance For Loan Losses	2,160	1,698
Charge-offs	(5,193)	(7,082)
Recoveries	3,174	3,142
Provisions For Loan Losses	2,546	4,402
Allowance For Loan Losses	2,687	2,160
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance For Loan Losses Disaggregated By Impairment Method, Individually	185	58
Allowance For Loan Losses Disaggregated By Impairment Method, Collectively	2,502	2,102
Allowance For Loan Losses	$ 2,687	$ 2,160