Loans and Leases - Age Analysis of Past Due Loans and Leases (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011		Sep. 30, 2011
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	$ 2,380	$ 9,963
60-89 Days Past Due	1,720	1,604
Greater Than 90 Days Past Due	690	365
Total Past Due	4,790	11,932
Current	1,423,412	1,392,374
Loans and Leases Held for Investment	1,469,511	1,446,406	[1]	1,446,273
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	690	365
Commercial, financial and agricultural [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	392	3,741
60-89 Days Past Due	342	33
Greater Than 90 Days Past Due	321
Total Past Due	1,055	3,774
Current	470,838	469,197
Loans and Leases Held for Investment	476,125	477,662
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	321
Real estate-commercial [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	507	2,212
60-89 Days Past Due		723
Greater Than 90 Days Past Due
Total Past Due	507	2,935
Current	495,330	491,498
Loans and Leases Held for Investment	515,743	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	79,175	74,656
Loans and Leases Held for Investment	95,245	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	192	340
60-89 Days Past Due
Greater Than 90 Days Past Due
Total Past Due	192	340
Current	32,453	32,026
Loans and Leases Held for Investment	32,820	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		1,783
60-89 Days Past Due	205
Greater Than 90 Days Past Due
Total Past Due	205	1,783
Current	147,525	130,405
Loans and Leases Held for Investment	148,053	132,245
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	224	298
60-89 Days Past Due	80	68
Greater Than 90 Days Past Due	58	117
Total Past Due	362	483
Current	81,975	79,968
Loans and Leases Held for Investment	82,337	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	252	386
60-89 Days Past Due	250	236
Greater Than 90 Days Past Due	289	204
Total Past Due	791	826
Current	41,787	44,089
Loans and Leases Held for Investment	42,626	44,965
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	289	204
Lease financings [Member]
Age Analysis of Past Due Loans and Leases
30-59 Days Past Due	813	1,203
60-89 Days Past Due	843	544
Greater Than 90 Days Past Due	22	44
Total Past Due	1,678	1,791
Current	74,329	70,535
Loans and Leases Held for Investment	76,562	73,225
Recorded Investment Greater than 90 Days Past Due and Accruing Interest	$ 22	$ 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.