Loans Held for Investment (LHFI) and Allowance for Loan Losses, excluding Covered Loans Part 2 (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	$ 164,303,000		$ 188,809,000
Total LHFI With No Related Allowance Recorded	64,878,000		70,186,000
Total LHFI With An Allowance Recorded	56,140,000		72,737,000
Total Carrying Amount	121,018,000		142,923,000
Related Allowance	8,047,000		11,797,000
Average Recorded Investment	131,971,000		142,044,000
Maximum Concentration Of Loan as a Percentage of Total Loans Held For Investment (in hundredths)	10.00%
Nonaccrual Financing Receivable, Specifically Evaluated for Impairment	75,100,000		97,600,000
Nonaccrual Financing Receivable, Allowance for Credit Losses, Specifically Evaluated for Impairment	3,300,000		8,300,000
Nonaccrual Financing Receivable, Allowance For Credit Losses, Charge-offs, Specifically Evaluated For Impairment	16,100,000	14,200,000
Nonaccrual Financing Receivable Specifically Evaluated For Impairment, Allowance For Credit Losses, Provisions	5,400,000	1,800,000
Minimum loan amount for loan to be individually assessed for impairment	500,000
Nonaccrual Financing Receivable, Not Specifically Evaluated for Impairment	45,900,000		45,300,000
Nonaccrual Financing Receivable, Allowance for Credit Losses, Not Specifically Evaluated for Impairment	4,800,000		3,500,000
Financing Receivable, Excluding Covered Loans, Troubled Debt Recorded Investment	24,100,000		19,200,000
Financing Receivable, Excluding Covered Loans, Related Allowance	1,300,000		1,900,000
Financing Receivable, Excluding Covered Loans, Related Charge-offs	1,400,000	102,000
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	71,120,000		81,945,000
Total LHFI With No Related Allowance Recorded	29,286,000		33,201,000
Total LHFI With An Allowance Recorded	16,771,000		24,630,000
Total Carrying Amount	46,057,000		57,831,000
Related Allowance	4,207,000		6,782,000
Average Recorded Investment	51,944,000		69,817,000
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	32,472,000		41,475,000
Total LHFI With No Related Allowance Recorded	2,380,000		3,082,000
Total LHFI With An Allowance Recorded	21,224,000		27,230,000
Total Carrying Amount	23,604,000		30,312,000
Related Allowance	630,000		1,745,000
Average Recorded Investment	26,958,000		30,888,000
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	34,218,000		35,679,000
Total LHFI With No Related Allowance Recorded	19,296,000		18,582,000
Total LHFI With An Allowance Recorded	9,759,000		10,431,000
Total Carrying Amount	29,055,000		29,013,000
Related Allowance	1,291,000		1,580,000
Average Recorded Investment	29,034,000		23,535,000
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	5,918,000		7,009,000
Total LHFI With No Related Allowance Recorded	4,218,000		5,042,000
Total LHFI With An Allowance Recorded	902,000		1,113,000
Total Carrying Amount	5,120,000		6,155,000
Related Allowance	45,000		95,000
Average Recorded Investment	5,637,000		4,126,000
Commercial And Industrial Loans Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	16,741,000		17,413,000
Total LHFI With No Related Allowance Recorded	8,945,000		9,172,000
Total LHFI With An Allowance Recorded	6,235,000		6,935,000
Total Carrying Amount	15,180,000		16,107,000
Related Allowance	1,812,000		1,514,000
Average Recorded Investment	15,644,000		11,369,000
Consumer Loans Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	1,309,000		2,420,000
Total LHFI With An Allowance Recorded	997,000		2,112,000
Total Carrying Amount	997,000		2,112,000
Related Allowance	12,000		23,000
Average Recorded Investment	1,555,000		1,544,000
Other Loans Financing Receivable [Member]
Loan and Lease Receivables, Impaired [Abstract]
Unpaid Principal Balance	2,525,000		2,868,000
Total LHFI With No Related Allowance Recorded	753,000		1,107,000
Total LHFI With An Allowance Recorded	252,000		286,000
Total Carrying Amount	1,005,000		1,393,000
Related Allowance	50,000		58,000
Average Recorded Investment	$ 1,199,000		$ 765,000