Impaired Loans and Valuation Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Contract
Modified Loans
Number of Contracts	7
Pre-Modification Outstanding Recorded Investment	$ 1,230
Post-Modification Outstanding Recorded Investment	1,072
Specific Reserve Recorded	0
Valuation Allowance Recorded	158
Construction and land development [Member]
Modified Loans
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	14
Post-Modification Outstanding Recorded Investment	13
Specific Reserve Recorded	0
Valuation Allowance Recorded	1
Residential real estate [Member]
Modified Loans
Number of Contracts	3
Pre-Modification Outstanding Recorded Investment	138
Post-Modification Outstanding Recorded Investment	119
Specific Reserve Recorded	0
Valuation Allowance Recorded	19
Commercial real estate [Member]
Modified Loans
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment	986
Post-Modification Outstanding Recorded Investment	866
Specific Reserve Recorded	0
Valuation Allowance Recorded	120
Commercial and financial [Member]
Modified Loans
Number of Contracts	0
Pre-Modification Outstanding Recorded Investment	0
Post-Modification Outstanding Recorded Investment	0
Specific Reserve Recorded	0
Valuation Allowance Recorded	0
Consumer [Member]
Modified Loans
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	92
Post-Modification Outstanding Recorded Investment	74
Specific Reserve Recorded	0
Valuation Allowance Recorded	$ 18