Loans and Leases - Types of Concessions Granted on Troubled Debt Restructured Loans (Details 11) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Loan	Dec. 31, 2011 Loan
Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	21	15
Amount	$ 7,815	$ 4,982
Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	13	2
Amount	3,635	80
Accruing Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	5	5
Amount	2,630	2,435
Accruing Troubled Debt Restructured Loans [Member] | Real estate-construction [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3	5
Amount	1,550	2,182
Accruing Troubled Debt Restructured Loans [Member] | Real estate-residential secured for business purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		98
Accruing Troubled Debt Restructured Loans [Member] | Real estate-residential secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		156
Accruing Troubled Debt Restructured Loans [Member] | Real estate-home equity secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		31
Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	4	4
Amount	1,057	11,429
Nonaccrual Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	2
Amount	448
Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	3
Amount	124	11,368
Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-residential secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	1
Amount	485	61
Maturity Date Extension and Interest Rate Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		3
Amount		1,322
Maturity Date Extension and Interest Rate Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		2
Amount		80
Maturity Date Extension and Interest Rate Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		1,242
Interest Only Terms Extension [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	10	9
Amount	5,133	3,375
Interest Only Terms Extension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	4
Amount	1,316
Interest Only Terms Extension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3	4
Amount	2,267	1,193
Interest Only Terms Extension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-construction [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3	5
Amount	1,550	2,182
Interest Only Terms Extension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		1,936
Interest Only Terms Extension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		1,936
Interest Rate Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		98
Interest Rate Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-residential secured for business purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		98
Interest Rate Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		6,667
Interest Rate Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		6,667
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	7	2
Amount	640	187
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	6
Amount	452
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1
Amount	188
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-residential secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		156
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-home equity secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		31
Temporary Payment Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	2
Amount	485	2,826
Temporary Payment Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans		1
Amount		2,765
Temporary Payment Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-residential secured for personal purpose [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1	1
Amount	485	61
Maturity Date Extension [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	4
Amount	2,042
Maturity Date Extension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3
Amount	1,867
Maturity Date Extension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1
Amount	175
Temporary Payment Suspension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3
Amount	572
Temporary Payment Suspension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	2
Amount	448
Temporary Payment Suspension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Real estate-commercial real estate [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	1
Amount	$ 124