Loans (Details 8) (Commercial Loan Portfolio [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Loans	Sep. 30, 2011 Loans	Sep. 30, 2012 Loans	Sep. 30, 2011 Loans
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	32	39	104	109
Performing and nonperforming modified TDRs, Pre-modification recorded investment	$ 3,443	$ 5,010	$ 17,876	$ 14,756
Performing and nonperforming modified TDRs, Post-modification recorded investment	3,392	4,911	17,665	14,506
Subtotal-commercial loan portfolio [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	17	14	39	41
Performing and nonperforming modified TDRs, Pre-modification recorded investment	2,091	2,866	10,793	8,670
Performing and nonperforming modified TDRs, Post-modification recorded investment	2,091	2,866	10,793	8,670
Consumer loan portfolio (real estate residential) [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	15	25	65	68
Performing and nonperforming modified TDRs, Pre-modification recorded investment	1,352	2,144	7,083	6,086
Performing and nonperforming modified TDRs, Post-modification recorded investment	1,301	2,045	6,872	5,836
Commercial [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	9	5	19	20
Performing and nonperforming modified TDRs, Pre-modification recorded investment	665	733	3,891	3,560
Performing and nonperforming modified TDRs, Post-modification recorded investment	665	733	3,891	3,560
Real estate commercial [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	8	9	19	21
Performing and nonperforming modified TDRs, Pre-modification recorded investment	1,426	2,133	5,264	5,110
Performing and nonperforming modified TDRs, Post-modification recorded investment	1,426	2,133	5,264	5,110
Land development [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	0		1
Performing and nonperforming modified TDRs, Pre-modification recorded investment	0		1,638
Performing and nonperforming modified TDRs, Post-modification recorded investment	$ 0		$ 1,638