Loans, Troubled Debt Restructurings Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Loans modified and considered troubled debt restructurings [Abstract]
Number	8	2
Pre-modification recorded investment	$ 10,023	$ 1,123
Post-modification recorded investment	10,023	1,123
Loans modified as troubled debt restructurings [Abstract]
Adjusted interest rate	736	1,123
Extended maturity	7,070	0
Combined rate and maturity	2,217	0
Commitments to lend additional funds to loan customers whose terms have been modified in troubled debt restructurings	0	0
Commercial [Member]
Loans modified and considered troubled debt restructurings [Abstract]
Number	1	0
Pre-modification recorded investment	3,155	0
Post-modification recorded investment	3,155	0
Loans modified as troubled debt restructurings [Abstract]
Adjusted interest rate	0	0
Extended maturity	3,155	0
Combined rate and maturity	0	0
Commercial mortgage [Member]
Loans modified and considered troubled debt restructurings [Abstract]
Number	3	1
Pre-modification recorded investment	3,167	759
Post-modification recorded investment	3,167	759
Loans modified as troubled debt restructurings [Abstract]
Adjusted interest rate	736	759
Extended maturity	214	0
Combined rate and maturity	2,217	0
Construction [Member]
Loans modified and considered troubled debt restructurings [Abstract]
Number	4	0
Pre-modification recorded investment	3,701	0
Post-modification recorded investment	3,701	0
Loans modified as troubled debt restructurings [Abstract]
Adjusted interest rate	0	0
Extended maturity	3,701	0
Combined rate and maturity	0	0
Residential mortgage [Member]
Loans modified and considered troubled debt restructurings [Abstract]
Number	0	1
Pre-modification recorded investment	0	364
Post-modification recorded investment	0	364
Loans modified as troubled debt restructurings [Abstract]
Adjusted interest rate	0	364
Extended maturity	0	0
Combined rate and maturity	$ 0	$ 0