Loans (Details 8) (Commercial Loan Portfolio [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Loans	Jun. 30, 2011 Loans	Jun. 30, 2012 Loans	Jun. 30, 2011 Loans
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	33,000	39,000	64,000	75,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment	$ 6,049	$ 5,220	$ 13,633	$ 10,498
Performing and nonperforming modified TDRs, Post-modification recorded investment	5,984	5,120	13,474	10,330
Subtotal-commercial loan portfolio [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	11,000	12,000	22,000	26,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment	4,273	2,629	8,702	5,696
Performing and nonperforming modified TDRs, Post-modification recorded investment	4,273	2,629	8,702	5,696
Consumer loan portfolio (real estate residential) [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	22,000	27,000	42,000	49,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment	1,776	2,591	4,931	4,802
Performing and nonperforming modified TDRs, Post-modification recorded investment	1,711	2,491	4,772	4,634
Commercial [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	5,000	5,000	10,000	14,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment	1,964	759	3,225	2,267
Performing and nonperforming modified TDRs, Post-modification recorded investment	1,964	759	3,225	2,267
Real estate commercial [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans	6,000	7,000	11,000	12,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment	2,309	1,870	3,839	3,429
Performing and nonperforming modified TDRs, Post-modification recorded investment	2,309	1,870	3,839	3,429
Land development [Member]
Schedule providing information on performing and nonperforming TDRs
Performing and nonperforming modified TDRs, Number of loans			1,000
Performing and nonperforming modified TDRs, Pre-modification recorded investment			1,638
Performing and nonperforming modified TDRs, Post-modification recorded investment			$ 1,638