Loans and Leases - Age Analysis of Past Due Loans and Leases (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011		Jun. 30, 2011
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	$ 3,764	$ 9,963
60-89 Days Past Due	1,021	1,604
Greater Than 90 Days Past Due	384	365
Total Past Due	5,169	11,932
Current	1,415,927	1,392,374
Loans and leases	1,465,449	1,446,406	[1]	1,438,707
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	384	365
Commercial, financial and agricultural [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	137	3,741
60-89 Days Past Due	272	33
Greater Than 90 Days Past Due	20
Total Past Due	429	3,774
Current	491,879	476,222
Loans and leases	497,955	484,687
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	20
Real estate-commercial [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	1,890	2,212
60-89 Days Past Due		723
Greater Than 90 Days Past Due
Total Past Due	1,890	2,935
Current	494,516	491,498
Loans and leases	517,282	514,953
Recorded Investment Greater than 90 Days Past Due and Accruing Interest
Real estate-construction [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due
60-89 Days Past Due
Greater Than 90 Days Past Due
Total Past Due
Current	63,241	74,656
Loans and leases	79,910	90,397
Recorded Investment Greater than 90 Days Past Due and Accruing Interest
Real estate-residential secured for business purpose [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	295	340
60-89 Days Past Due
Greater Than 90 Days Past Due
Total Past Due	295	340
Current	31,625	32,026
Loans and leases	32,097	32,481
Recorded Investment Greater than 90 Days Past Due and Accruing Interest
Real estate-residential secured for personal purpose [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	112	1,783
60-89 Days Past Due
Greater Than 90 Days Past Due
Total Past Due	112	1,783
Current	139,793	123,380
Loans and leases	140,217	125,220
Recorded Investment Greater than 90 Days Past Due and Accruing Interest
Real estate-home equity secured for personal purpose [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	375	298
60-89 Days Past Due	266	68
Greater Than 90 Days Past Due	58	117
Total Past Due	699	483
Current	77,997	79,968
Loans and leases	78,696	80,478
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	58	117
Loans to individuals [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	393	386
60-89 Days Past Due	173	236
Greater Than 90 Days Past Due	237	204
Total Past Due	803	826
Current	43,185	44,089
Loans and leases	44,037	44,965
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	237	204
Lease Financings [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	562	1,203
60-89 Days Past Due	310	544
Greater Than 90 Days Past Due	69	44
Total Past Due	941	1,791
Current	73,691	70,535
Loans and leases	75,255	73,225
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	$ 69	$ 44

[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.