Loans and Leases - Credit Quality Indicators (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011		Jun. 30, 2011
Credit Quality Indicators
Loans and leases	$ 1,465,449	$ 1,446,406	[1]	$ 1,438,707
Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	497,955	484,687
Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	517,282	514,953
Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	79,910	90,397
Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	32,097	32,481
Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	140,217	125,220
Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	78,696	80,478
Loans to individuals [Member]
Credit Quality Indicators
Loans and leases	44,037	44,965
Lease Financings [Member]
Credit Quality Indicators
Loans and leases	75,255	73,225
Grade:1. Cash Secured / 2. Fully Secured [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	2,135	2,426
Grade:1. Cash Secured / 2. Fully Secured [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases
Grade:1. Cash Secured / 2. Fully Secured [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases
Grade:1. Cash Secured / 2. Fully Secured [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases
Grade:3. Strong [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	8,631	4,441
Grade:3. Strong [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	9,039	9,365
Grade:3. Strong [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	585	1,124
Grade:3. Strong [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases
Grade:4. Satisfactory [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	37,464	32,730
Grade:4. Satisfactory [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	32,282	28,517
Grade:4. Satisfactory [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	2,672	89
Grade:4. Satisfactory [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	349	1,309
Grade:5. Acceptable [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	297,403	296,860
Grade:5. Acceptable [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	286,562	296,499
Grade:5. Acceptable [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	30,487	35,207
Grade:5. Acceptable [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	18,418	18,990
Grade:6. Pre-watch [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	85,253	79,402
Grade:6. Pre-watch [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	112,196	100,581
Grade:6. Pre-watch [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	27,368	33,993
Grade:6. Pre-watch [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	10,026	8,853
Grade:7. Special Mention [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	18,194	26,162
Grade:7. Special Mention [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	25,872	29,055
Grade:7. Special Mention [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	1,477	1,715
Grade:7. Special Mention [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	731	663
Grade:8. Substandard [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	47,302	40,634
Grade:8. Substandard [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	50,338	49,943
Grade:8. Substandard [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases	17,321	18,269
Grade:8. Substandard [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases	2,573	2,666
Grade:9. Doubtful [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases	1,573	2,032
Grade:9. Doubtful [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases	993	993
Grade:9. Doubtful [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases
Grade:9. Doubtful [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases
Grade:10. Loss [Member] | Commercial, financial and agricultural [Member]
Credit Quality Indicators
Loans and leases
Grade:10. Loss [Member] | Real estate-commercial [Member]
Credit Quality Indicators
Loans and leases
Grade:10. Loss [Member] | Real estate-construction [Member]
Credit Quality Indicators
Loans and leases
Grade:10. Loss [Member] | Real estate-residential secured for business purpose [Member]
Credit Quality Indicators
Loans and leases
Performing Financing Receivable [Member] | Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	139,905	125,163
Performing Financing Receivable [Member] | Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	78,638	80,334
Performing Financing Receivable [Member] | Loans to individuals [Member]
Credit Quality Indicators
Loans and leases	43,751	44,711
Performing Financing Receivable [Member] | Lease Financings [Member]
Credit Quality Indicators
Loans and leases	74,563	72,282
Nonperforming Financing Receivable [Member] | Real estate-residential secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	312	57
Nonperforming Financing Receivable [Member] | Real estate-home equity secured for personal purpose [Member]
Credit Quality Indicators
Loans and leases	58	144
Nonperforming Financing Receivable [Member] | Loans to individuals [Member]
Credit Quality Indicators
Loans and leases	286	254
Nonperforming Financing Receivable [Member] | Lease Financings [Member]
Credit Quality Indicators
Loans and leases	$ 692	$ 943

[1] Note: The consolidated balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U. S. generally accepted accounting principles for complete financial statements. Certain amounts have been reclassified to conform to the current-year presentation. See accompanying notes to the unaudited consolidated financial statements.