Allowance For Loan Losses (Allowance for Loan Losses, by Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 39,795	$ 68,729	$ 39,360	$ 93,687
Charge-offs	(10,285)	(45,662)	(14,300)	(91,571)
Recoveries	1,263	2,719	2,646	3,487
Provision for losses charged to continuing operations	7,778	33,580	10,845	53,763
Balance, end of period	38,551	59,366	38,551	59,366
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	6,005	8,719	5,776	11,144
Charge-offs	(937)	(4,192)	(1,631)	(8,467)
Recoveries	235	467	489	533
Provision for losses charged to continuing operations	1,848	1,533	2,517	3,317
Balance, end of period	7,151	6,527	7,151	6,527
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	10,912	32,947	11,995	46,792
Charge-offs	(4,521)	(21,510)	(6,296)	(44,172)
Recoveries	244	714	845	904
Provision for losses charged to continuing operations	4,685	16,268	4,776	24,895
Balance, end of period	11,320	28,419	11,320	28,419
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	12,103	9,751	8,885	7,742
Charge-offs	(2,454)	(4,585)	(3,159)	(6,621)
Recoveries	244	469	377	562
Provision for losses charged to continuing operations	(1,109)	3,395	2,681	7,347
Balance, end of period	8,784	9,030	8,784	9,030
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,799	15,668	11,063	26,851
Charge-offs	(954)	(14,002)	(992)	(30,180)
Recoveries	262	693	336	742
Provision for losses charged to continuing operations	1,111	11,260	(1,189)	16,206
Balance, end of period	9,218	13,619	9,218	13,619
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,976	1,644	1,641	1,158
Charge-offs	(1,419)	(1,373)	(2,222)	(2,131)
Recoveries	278	376	599	746
Provision for losses charged to continuing operations	1,243	1,124	2,060	1,998
Balance, end of period	$ 2,078	$ 1,771	$ 2,078	$ 1,771