Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 20,345	$ 26,785	$ 29,314
Charge-offs	(5,604)	(7,703)	(13,344)
Recoveries	3,435	6,634	10,292
Provision (Recovery)	(2,981)	(5,371)	523
Ending balance	15,195	20,345	26,785
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,915	2,931	3,238
Charge-offs	(309)	(1,449)	(1,277)
Recoveries	1,036	951	1,623
Provision (Recovery)	(2,240)	1,482	(653)
Ending balance	2,402	3,915	2,931
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,163	5,233	4,987
Charge-offs	(138)	(719)	(1,080)
Recoveries	712	2,110	2,681
Provision (Recovery)	(1,968)	(3,461)	(1,355)
Ending balance	1,769	3,163	5,233
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	5,847	8,869	8,701
Charge-offs	(1,297)	(1,273)	(4,032)
Recoveries	555	1,187	1,266
Provision (Recovery)	36	(2,936)	2,934
Ending balance	5,141	5,847	8,869
Real estate - mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,179	7,195	9,627
Charge-offs	(410)	(1,746)	(2,808)
Recoveries	487	1,165	3,048
Provision (Recovery)	(1,928)	(2,435)	(2,672)
Ending balance	2,328	4,179	7,195
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,241	2,557	2,761
Charge-offs	(3,450)	(2,516)	(4,147)
Recoveries	645	1,221	1,674
Provision (Recovery)	3,119	1,979	2,269
Ending balance	$ 3,555	$ 3,241	$ 2,557