Loans and Leases - Major Categories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	$ 1,481,862	$ 1,446,406
Unearned lease income	(12,355)	(9,965)
Net deferred costs (fees)	1,432	876
Overdraft deposits	128	123
Commercial, financial and agricultural [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	468,421	477,662
Real estate-commercial [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	530,122	514,953
Real estate-construction [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	91,250	90,397
Real estate-residential secured for business purpose [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	35,179	32,481
Real estate-residential secured for personal purpose [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	146,526	132,245
Real estate-home equity secured for personal purpose [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	82,727	80,478
Loans to individuals [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	43,780	44,965
Lease financings [Member]
Summary of Major Loan and Lease Categories
Total loans and leases held for investment, net of deferred income	$ 83,857	$ 73,225