Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 26,785	$ 29,314	$ 39,360
Charge-offs	(7,703)	(13,344)	(30,968)
Recoveries	6,634	10,292	6,873
Provision (Recovery)	(5,371)	523	14,049
Balance, end of period	20,345	26,785	29,314
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,931	3,238	5,776
Charge-offs	(1,449)	(1,277)	(3,494)
Recoveries	951	1,623	991
Provision (Recovery)	1,482	(653)	(35)
Balance, end of period	3,915	2,931	3,238
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,233	4,987	11,995
Charge-offs	(719)	(1,080)	(11,084)
Recoveries	2,110	2,681	3,237
Provision (Recovery)	(3,461)	(1,355)	839
Balance, end of period	3,163	5,233	4,987
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,869	8,701	8,885
Charge-offs	(1,273)	(4,032)	(6,422)
Recoveries	1,187	1,266	573
Provision (Recovery)	(2,936)	2,934	5,665
Balance, end of period	5,847	8,869	8,701
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	7,195	9,627	11,063
Charge-offs	(1,746)	(2,808)	(5,510)
Recoveries	1,165	3,048	852
Provision (Recovery)	(2,435)	(2,672)	3,222
Balance, end of period	4,179	7,195	9,627
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,557	2,761	1,641
Charge-offs	(2,516)	(4,147)	(4,458)
Recoveries	1,221	1,674	1,220
Provision (Recovery)	1,979	2,269	4,358
Balance, end of period	$ 3,241	$ 2,557	$ 2,761