Loans and Allowance for Loan Losses (Details 13) (USD $)				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Non-acquired loans item	Mar. 31, 2012 Non-acquired loans item	Mar. 31, 2013 Non-acquired loans Interest rate modification item	Mar. 31, 2012 Non-acquired loans Interest rate modification item	Mar. 31, 2012 Non-acquired loans Interest rate modification Construction and land development item	Mar. 31, 2012 Non-acquired loans Interest rate modification Commercial owner occupied item	Mar. 31, 2013 Non-acquired loans Interest rate modification Consumer owner occupied item	Mar. 31, 2012 Non-acquired loans Interest rate modification Consumer owner occupied item	Mar. 31, 2013 Non-acquired loans Term modification item	Mar. 31, 2012 Non-acquired loans Term modification item	Mar. 31, 2012 Non-acquired loans Term modification Construction and land development item	Mar. 31, 2013 Non-acquired loans Term modification Commercial and industrial item
Loans and Allowance for Loan Losses
Number of loans				2	4	1	3	1	1	1	1	1	1	1	1
Pre-Modification Outstanding Recorded Investment				$ 820,000	$ 1,989,000	$ 124,000	$ 1,759,000	$ 165,000	$ 443,000	$ 124,000	$ 1,151,000	$ 696,000	$ 230,000	$ 230,000	$ 696,000
Post-Modification Outstanding Recorded Investment				462,000	1,985,000	124,000	1,755,000	164,000	443,000	124,000	1,148,000	338,000	230,000	230,000	338,000
Balance of accruing TDRs	$ 5,000,000	$ 6,300,000	$ 6,100,000