Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 15,195	$ 20,345
Charge-offs	(1,094)	(994)
Recoveries	674	794
Provision (recovery of provision)	(535)	(1,137)
Balance, end of period	14,240	19,008
Commercial and Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,402	3,915
Charge-offs	(159)	(49)
Recoveries	253	221
Provision (recovery of provision)	(452)	(689)
Balance, end of period	2,044	3,398
Real estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,769	3,163
Charge-offs	0	(81)
Recoveries	136	196
Provision (recovery of provision)	(609)	(158)
Balance, end of period	1,296	3,120
Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,141	5,847
Charge-offs	(64)	(125)
Recoveries	130	138
Provision (recovery of provision)	(832)	(237)
Balance, end of period	4,375	5,623
Real estate - Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,328	4,179
Charge-offs	0	(7)
Recoveries	40	58
Provision (recovery of provision)	175	(1,078)
Balance, end of period	2,543	3,152
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	3,555	3,241
Charge-offs	(871)	(732)
Recoveries	115	181
Provision (recovery of provision)	1,183	1,025
Balance, end of period	$ 3,982	$ 3,715