Loans and Allowance for Loan Losses (Troubled Debt Restructured) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Total restructured loans, Recorded Balance	$ 24,810	$ 25,780
Restructured loans, Allowance	1,094	574
Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		10
Loans restructured, Pre Modification Balance		1,966
Loans restructured, Post Modification Balance		1,964
Subsequent defaults, Number of Loans	5	11
Subsequent defaults, Amortized Cost	972	8,912
Term Extension and Renewals | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		17
Loans restructured, Pre Modification Balance		15,713
Loans restructured, Post Modification Balance		15,429
Construction and Land Development Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	0	136
Restructured loans without an allowance, Recorded Balance	1,719	2,725
Restructured loans, Allowance	0	61
Construction and Land Development Loans | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		27
Loans restructured, Pre Modification Balance		17,679
Loans restructured, Post Modification Balance		17,393
Subsequent defaults, Number of Loans	1	2
Subsequent defaults, Amortized Cost	295	1,951
Construction and Land Development Loans | Interest Rate Modifications | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified	2	3
Loans restructured, Pre Modification Balance	8,769	1,125
Loans restructured, Post Modification Balance	7,357	1,125
Construction and Land Development Loans | Term Extension and Renewals | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		6
Loans restructured, Pre Modification Balance		3,685
Loans restructured, Post Modification Balance		3,483
Other Commercial Real Estate Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	11,038	4,018
Restructured loans without an allowance, Recorded Balance	11,115	17,002
Restructured loans, Allowance	1,082	320
Other Commercial Real Estate Loans | Interest Rate Modifications | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		3
Loans restructured, Pre Modification Balance		674
Loans restructured, Post Modification Balance		672
Other Commercial Real Estate Loans | Term Extension and Renewals | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		7
Loans restructured, Pre Modification Balance		9,694
Loans restructured, Post Modification Balance		9,663
Other Commercial Real Estate Loans | Principal Forgiveness | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified	1
Loans restructured, Pre Modification Balance	8,724
Loans restructured, Post Modification Balance	7,313
Other Commercial Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	0	387
Restructured loans without an allowance, Recorded Balance	308	119
Restructured loans, Allowance	0	117
Other Commercial Loans | Year to Date
Financing Receivable, Modifications [Line Items]
Subsequent defaults, Number of Loans	1	5
Subsequent defaults, Amortized Cost	335	6,655
Other Commercial Loans | Interest Rate Modifications | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		1
Loans restructured, Pre Modification Balance		10
Loans restructured, Post Modification Balance		10
Other Commercial Loans | Term Extension and Renewals | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		1
Loans restructured, Pre Modification Balance		1,797
Loans restructured, Post Modification Balance		1,747
Other Commercial Loans | Foreclosure | Year to Date
Financing Receivable, Modifications [Line Items]
Subsequent defaults, Amortized Cost		1,118
Other 1-4 Family Residential Loans
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance	59	199
Restructured loans without an allowance, Recorded Balance	571	1,194
Restructured loans, Allowance	12	76
Other 1-4 Family Residential Loans | Year to Date
Financing Receivable, Modifications [Line Items]
Subsequent defaults, Number of Loans	3	4
Subsequent defaults, Amortized Cost	342	306
Other 1-4 Family Residential Loans | Interest Rate Modifications | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified	1	3
Loans restructured, Pre Modification Balance	45	157
Loans restructured, Post Modification Balance	44	157
Other 1-4 Family Residential Loans | Term Extension and Renewals | Year to Date
Financing Receivable, Modifications [Line Items]
Loans restructured, Number of Loans Modified		3
Loans restructured, Pre Modification Balance		537
Loans restructured, Post Modification Balance		536
Other 1-4 Family Residential Loans | Foreclosure | Year to Date
Financing Receivable, Modifications [Line Items]
Subsequent defaults, Amortized Cost	$ 152