Loans (Allowance for Loan Losses, by Segment Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 29,641	$ 39,795	$ 29,314	$ 39,360
Charge-offs	(6,102)	(10,285)	(9,113)	(14,300)
Recoveries	2,603	1,263	5,831	2,646
Provision for losses charged to continuing operations	(1,057)	7,778	(947)	10,845
Balance, end of period	25,085	38,551	25,085	38,551
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,373	6,005	3,238	5,776
Charge-offs	(875)	(937)	(1,194)	(1,631)
Recoveries	633	235	911	489
Provision for losses charged to continuing operations	(939)	1,848	(763)	2,517
Balance, end of period	2,192	7,151	2,192	7,151
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,594	10,912	4,987	11,995
Charge-offs	(584)	(4,521)	(928)	(6,296)
Recoveries	271	244	1,067	845
Provision for losses charged to continuing operations	371	4,685	526	4,776
Balance, end of period	5,652	11,320	5,652	11,320
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,803	12,103	8,701	8,885
Charge-offs	(2,537)	(2,454)	(3,169)	(3,159)
Recoveries	492	244	677	377
Provision for losses charged to continuing operations	642	(1,109)	1,191	2,681
Balance, end of period	7,400	8,784	7,400	8,784
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	9,291	8,799	9,627	11,063
Charge-offs	(1,371)	(954)	(2,262)	(992)
Recoveries	1,075	262	2,007	336
Provision for losses charged to continuing operations	(1,608)	1,111	(1,985)	(1,189)
Balance, end of period	7,387	9,218	7,387	9,218
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,580	1,976	2,761	1,641
Charge-offs	(735)	(1,419)	(1,560)	(2,222)
Recoveries	132	278	1,169	599
Provision for losses charged to continuing operations	477	1,243	84	2,060
Balance, end of period	$ 2,454	$ 2,078	$ 2,454	$ 2,078