Loans and the Allowance for Credit Losses (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
TDRs Defaulted Later Restructured
Recorded investment	$ 528	$ 2,251
Number of defaults	4	10
Commercial Real Estate Land and Construction [Member]
TDRs Defaulted Later Restructured
Recorded investment	0	0
Number of defaults	0	0
Commercial Real Estate Improved Property [Member]
TDRs Defaulted Later Restructured
Recorded investment	362	2,085
Number of defaults	3	9
Commercial Real Estate [Member]
TDRs Defaulted Later Restructured
Recorded investment	362	2,085
Number of defaults	3	9
Commercial and Industrial [Member]
TDRs Defaulted Later Restructured
Recorded investment	166	166
Number of defaults	1	1
Residential Real Estate [Member]
TDRs Defaulted Later Restructured
Recorded investment	0	0
Number of defaults	0	0
Home Equity [Member]
TDRs Defaulted Later Restructured
Recorded investment	0	0
Number of defaults	0	0
Consumer [Member]
TDRs Defaulted Later Restructured
Recorded investment	$ 0	$ 0
Number of defaults	0	0