Fair Value (Schedule Of Fair Value Of Assets And Liabilities Recorded On A Nonrecurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	$ 9,594	$ 10,942
Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Real Estate [Member] | Construction And Land Development [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	1,891	2,613
Real Estate [Member] | Residential, 1-4 Families [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis		539
Real Estate [Member] | Nonfarm, Nonresidential [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	4,186	4,372
Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	6,077	7,524
Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	3,517	3,418
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Real Estate [Member] | Construction And Land Development [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Real Estate [Member] | Residential, 1-4 Families [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Real Estate [Member] | Nonfarm, Nonresidential [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 1 [Member] | Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	9,594	10,942
Level 2 [Member] | Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 2 [Member] | Real Estate [Member] | Construction And Land Development [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	1,891	2,613
Level 2 [Member] | Real Estate [Member] | Residential, 1-4 Families [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis		539
Level 2 [Member] | Real Estate [Member] | Nonfarm, Nonresidential [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	4,186	4,372
Level 2 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	6,077	7,524
Level 2 [Member] | Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis	3,517	3,418
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Real Estate [Member] | Construction And Land Development [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Real Estate [Member] | Residential, 1-4 Families [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Real Estate [Member] | Nonfarm, Nonresidential [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis
Level 3 [Member] | Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets recorded as fair value on a nonrecurring basis