Loans and Leases - Credit Quality Indicators (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Credit Quality Indicators
Loans and leases held for investment	$ 1,481,862	$ 1,446,406
Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	468,421	477,662
Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	530,122	514,953
Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	91,250	90,397
Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	35,179	32,481
Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	146,526	132,245
Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	82,727	80,478
Loans to individuals [Member]
Credit Quality Indicators
Loans and leases held for investment	43,780	44,965
Lease financings [Member]
Credit Quality Indicators
Loans and leases held for investment	83,857	73,225
Grade:1. Cash Secured / 2. Fully Secured [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	2,263	2,426
Grade:3. Strong [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	5,227	4,441
Grade:3. Strong [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	9,591	9,365
Grade:3. Strong [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	3,907	1,124
Grade:4. Satisfactory [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	40,747	32,730
Grade:4. Satisfactory [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	25,837	28,517
Grade:4. Satisfactory [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	1,783	89
Grade:4. Satisfactory [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	335	1,309
Grade:5. Acceptable [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	260,042	289,835
Grade:5. Acceptable [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	321,194	296,499
Grade:5. Acceptable [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	26,331	35,207
Grade:5. Acceptable [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	22,764	18,990
Grade:6. Pre-watch [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	106,436	79,402
Grade:6. Pre-watch [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	110,476	100,581
Grade:6. Pre-watch [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	42,190	33,993
Grade:6. Pre-watch [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	8,458	8,853
Grade:7. Special Mention [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	31,825	26,162
Grade:7. Special Mention [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	16,187	29,055
Grade:7. Special Mention [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	548	1,715
Grade:7. Special Mention [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	288	663
Grade:8. Substandard [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment	21,881	40,634
Grade:8. Substandard [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	45,844	49,943
Grade:8. Substandard [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment	16,491	18,269
Grade:8. Substandard [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	3,334	2,666
Grade:9. Doubtful [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment		2,032
Grade:9. Doubtful [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment	993	993
Grade:10. Loss [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases held for investment
Grade:10. Loss [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases held for investment
Grade:10. Loss [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases held for investment
Grade:10. Loss [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases held for investment
Performing Financing Receivable [Member] | Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	145,722	132,188
Performing Financing Receivable [Member] | Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	82,673	80,334
Performing Financing Receivable [Member] | Loans to individuals [Member]
Credit Quality Indicators
Loans and leases held for investment	43,395	44,711
Performing Financing Receivable [Member] | Lease financings [Member]
Credit Quality Indicators
Loans and leases held for investment	83,412	72,282
Nonperforming Financing Receivable [Member] | Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	804	57
Nonperforming Financing Receivable [Member] | Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases held for investment	54	144
Nonperforming Financing Receivable [Member] | Loans to individuals [Member]
Credit Quality Indicators
Loans and leases held for investment	385	254
Nonperforming Financing Receivable [Member] | Lease financings [Member]
Credit Quality Indicators
Loans and leases held for investment	$ 445	$ 943