Loans and Leases - Types of Concessions Granted on Troubled Debt Restructured Loans (Details 9) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012 Loan
Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	12
Amount	$ 3,701
Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	7
Amount	1,537
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
Amount	834
Accruing Troubled Debt Restructured Loans [Member] | Real estate-construction [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	2
Amount	1,330
Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	3
Amount	572
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
Amount	124
Interest Only Terms Extension [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	8
Amount	3,293
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	2
Amount	647
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	2
Amount	1,330
Interest Only Terms Extension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
Interest Only Terms Extension [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
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
Amount
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans	4
Amount	408
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	3
Amount	221
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	187
Temporary Payment Reduction [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-construction [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
Temporary Payment Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
Temporary Payment Reduction [Member] | Nonaccrual Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
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
Amount
Temporary Payment Suspension [Member] | Accruing Troubled Debt Restructured Loans [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
Temporary Payment Suspension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Commercial, financial and agricultural [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
Temporary Payment Suspension [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
Amount
Temporary Payment Suspension [Member] | Accruing Troubled Debt Restructured Loans [Member] | Real estate-construction [Member]
Concessions granted on accruing and non-accrual loans restructured
No. of Loans
Amount
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