Allowance For Loan Losses (Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	$ 12,474	$ 10,395
Past due, 60 - 89 days	7,422	11,807
Past due, 90 or more days	58,209	54,711
Past due, total	78,105	76,913
Current	916,626	809,786
PI loans, no credit deterioration	250,433	330,836
PI loans, credit deterioration	36,659	0
Loans held for investment	1,281,823	1,217,535
90 or more days past due and accruing	427	3,000
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	893	335
Past due, 60 - 89 days	437	425
Past due, 90 or more days	2,681	2,755
Past due, total	4,011	3,515
Current	54,079	62,702
PI loans, no credit deterioration	1,366	28,872
PI loans, credit deterioration	18,911
Loans held for investment	78,367	95,089
90 or more days past due and accruing	79	305
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	1,353	1,850
Past due, 60 - 89 days	4,813	2,206
Past due, 90 or more days	12,844	21,438
Past due, total	19,010	25,494
Current	50,893	59,671
PI loans, no credit deterioration	3,485	7,641
PI loans, credit deterioration	2,188
Loans held for investment	75,576	92,806
90 or more days past due and accruing	0	1,400
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	5,037	4,544
Past due, 60 - 89 days	823	2,253
Past due, 90 or more days	13,009	14,125
Past due, total	18,869	20,922
Current	524,953	379,909
PI loans, no credit deterioration	42,971	52,894
PI loans, credit deterioration	3,179
Loans held for investment	589,972	453,725
90 or more days past due and accruing	0	292
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	4,727	2,926
Past due, 60 - 89 days	1,332	6,645
Past due, 90 or more days	29,674	16,330
Past due, total	35,733	25,901
Current	244,240	265,861
PI loans, no credit deterioration	201,441	239,621
PI loans, credit deterioration	12,307
Loans held for investment	493,721	531,383
90 or more days past due and accruing	348	1,003
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, 30 - 59 days	464	740
Past due, 60 - 89 days	17	278
Past due, 90 or more days	1	63
Past due, total	482	1,081
Current	42,461	41,643
PI loans, no credit deterioration	1,170	1,808
PI loans, credit deterioration	74
Loans held for investment	44,187	44,532
90 or more days past due and accruing		$ 0