Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 26,785	$ 29,314
Charge-offs	(1,977)	(3,010)
Recoveries	1,915	3,227
Provision for losses charged to continuing operations	(684)	110
Balance, end of period	26,039	29,641
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,931	3,238
Charge-offs	(389)	(319)
Recoveries	392	278
Provision for losses charged to continuing operations	507	176
Balance, end of period	3,441	3,373
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,233	4,987
Charge-offs	(533)	(344)
Recoveries	964	796
Provision for losses charged to continuing operations	(356)	155
Balance, end of period	5,308	5,594
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,869	8,701
Charge-offs	(484)	(632)
Recoveries	235	185
Provision for losses charged to continuing operations	(697)	549
Balance, end of period	7,923	8,803
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	7,195	9,627
Charge-offs	(66)	(891)
Recoveries	66	932
Provision for losses charged to continuing operations	(229)	(377)
Balance, end of period	6,966	9,291
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,557	2,761
Charge-offs	(505)	(824)
Recoveries	258	1,036
Provision for losses charged to continuing operations	91	(393)
Balance, end of period	$ 2,401	$ 2,580