Loans and Allowance for Loan Losses (Troubled Debt Restructured) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 loan	Dec. 31, 2012	Mar. 31, 2012 loan
Financing Receivable, Modifications [Line Items]
Total restructured loans, Recorded Balance	$ 22,705	$ 24,810
Restructured loans, Allowance	1,226	1,094
Subsequent defaults, Number of loans	0		2
Subseuqent defaults, Amortized cost			487
Construction and Land Development Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	398	0
Restructured loans without an allowance, Recorded Balance	1,310	1,719
Restructured loans, Allowance	170	0
Other Commercial Real Estate Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	8,559	11,038
Restructured loans without an allowance, Recorded Balance	11,751	11,115
Restructured loans, Allowance	984	1,082
Other Commercial Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	63	0
Restructured loans without an allowance, Recorded Balance	0	308
Restructured loans, Allowance	63	0
Subsequent defaults, Number of loans			1
Subseuqent defaults, Amortized cost			335
Other 1-4 Family Residential Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	59	59
Restructured loans without an allowance, Recorded Balance	565	571
Restructured loans, Allowance	9	12
Subsequent defaults, Number of loans			1
Subseuqent defaults, Amortized cost			$ 152