Loans and Allowance for Loan Losses (Troubled Debt Restructured) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Quarter to Date loan	Sep. 30, 2011 Quarter to Date loan	Sep. 30, 2012 Year to Date loan	Sep. 30, 2011 Year to Date loan	Sep. 30, 2011 Term Extension and Renewals Quarter to Date loan	Sep. 30, 2011 Term Extension and Renewals Year to Date loan	Sep. 30, 2012 Construction and Land Development Loans	Dec. 31, 2011 Construction and Land Development Loans	Sep. 30, 2012 Construction and Land Development Loans Quarter to Date loan	Sep. 30, 2011 Construction and Land Development Loans Quarter to Date loan	Sep. 30, 2012 Construction and Land Development Loans Year to Date loan	Sep. 30, 2011 Construction and Land Development Loans Year to Date loan	Sep. 30, 2011 Construction and Land Development Loans Interest Rate Modifications Quarter to Date loan	Sep. 30, 2011 Construction and Land Development Loans Interest Rate Modifications Year to Date loan	Sep. 30, 2011 Construction and Land Development Loans Term Extension and Renewals Quarter to Date loan	Sep. 30, 2011 Construction and Land Development Loans Term Extension and Renewals Year to Date loan	Sep. 30, 2012 Other Commercial Real Estate Loans	Dec. 31, 2011 Other Commercial Real Estate Loans	Sep. 30, 2011 Other Commercial Real Estate Loans Interest Rate Modifications Quarter to Date loan	Sep. 30, 2011 Other Commercial Real Estate Loans Interest Rate Modifications Year to Date loan	Sep. 30, 2011 Other Commercial Real Estate Loans Term Extension and Renewals Quarter to Date loan	Sep. 30, 2011 Other Commercial Real Estate Loans Term Extension and Renewals Year to Date loan	Sep. 30, 2012 Other Commercial Loans	Dec. 31, 2011 Other Commercial Loans	Sep. 30, 2012 Other Commercial Loans Quarter to Date loan	Sep. 30, 2011 Other Commercial Loans Quarter to Date loan	Sep. 30, 2012 Other Commercial Loans Year to Date loan	Sep. 30, 2011 Other Commercial Loans Year to Date loan	Sep. 30, 2011 Other Commercial Loans Term Extension and Renewals Quarter to Date loan	Sep. 30, 2011 Other Commercial Loans Term Extension and Renewals Year to Date loan	Sep. 30, 2011 Other Commercial Loans Foreclosure Year to Date	Sep. 30, 2012 Other 1-4 Family Residential Loans	Dec. 31, 2011 Other 1-4 Family Residential Loans	Sep. 30, 2012 Other 1-4 Family Residential Loans Quarter to Date loan	Sep. 30, 2011 Other 1-4 Family Residential Loans Quarter to Date loan	Sep. 30, 2012 Other 1-4 Family Residential Loans Year to Date loan	Sep. 30, 2011 Other 1-4 Family Residential Loans Year to Date loan	Sep. 30, 2011 Other 1-4 Family Residential Loans Interest Rate Modifications Year to Date loan	Sep. 30, 2011 Other 1-4 Family Residential Loans Term Extension and Renewals Quarter to Date loan	Sep. 30, 2011 Other 1-4 Family Residential Loans Term Extension and Renewals Year to Date loan	Sep. 30, 2012 Other 1-4 Family Residential Loans Foreclosure Year to Date
Financing Receivable, Modifications [Line Items]
Restructured loans with an allowance, Recorded Balance									$ 442	$ 136									$ 4,571	$ 4,018					$ 238	$ 387								$ 60	$ 199
Restructured loans without an allowance, Recorded Balance									1,219	2,725									11,483	17,002					79	119								568	1,194
Total restructured loans, Recorded Balance	18,660	25,780
Restructured loans, Allowance	1,236	574							63	61									922	320					238	117								13	76
Loans restructured, Number of Loans Modified				2		8	3	14				5		22	1	3	1	4			1	2	1	7							0	1								3	1	2
Loans restructured, Pre Modification Balance				646		1,654	858	14,943				1,504		16,597	465	1,156	404	2,987			181	340	109	9,663							0	1,797								158	345	496
Loans restructured, Post Modification Balance				643		1,620	858	14,943				1,501		16,563	463	1,125	404	2,987			180	338	109	9,663							0	1,797								157	345	496
Subsequent defaults, Number of Loans			2	9	5	9					1	2	1	2													0	4	1	4						1	3	3	3
Subsequent defaults, Amortized Cost			$ 333	$ 8,603	$ 972	$ 8,603					$ 295	$ 1,951	$ 295	$ 1,951													$ 0	$ 6,497	$ 335	$ 6,497			$ 1,118			$ 38	$ 155	$ 342	$ 155				$ 152