Loans (Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loans	Mar. 31, 2012 loans
Financing Receivable, Modifications [Line Items]
Number of loans	5	11
Pre-modification outstanding recorded investment	$ 2,928	$ 426
Post-modification outstanding recorded investment	2,580	426
Commercial and agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	0
Pre-modification outstanding recorded investment	0	0
Post-modification outstanding recorded investment	0	0
Real estate - construction [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	2
Pre-modification outstanding recorded investment	0	192
Post-modification outstanding recorded investment	0	192
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	4	8
Pre-modification outstanding recorded investment	1,777	210
Post-modification outstanding recorded investment	1,773	210
Real estate - mortgage, commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1	0
Pre-modification outstanding recorded investment	1,151	0
Post-modification outstanding recorded investment	807	0
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	1
Pre-modification outstanding recorded investment	0	24
Post-modification outstanding recorded investment	$ 0	$ 24