Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of Impaired loans by loan class
Recorded Investment, With no related allowance recorded	$ 9,427	$ 13,151
Unpaid Principal Balance, With no related allowance recorded	15,370	19,944
Recorded Investment, With an allowance recorded	27,591	26,622
Unpaid Principal Balance, With an allowance recorded	29,111	27,257
Impaired Financing Receivable, With Related Allowance Related Allowance	3,658	2,390
Impaired loans, Recorded Investment	37,018	39,773
Impaired loans, Unpaid Principal Balance	44,481	47,201
Impaired loans, Related Allowance	3,658	2,390
Commercial [Member]
Summary of Impaired loans by loan class
Recorded Investment, With an allowance recorded	56	49
Unpaid Principal Balance, With an allowance recorded	56	49
Impaired Financing Receivable, With Related Allowance Related Allowance	5	7
Impaired loans, Recorded Investment	56	49
Impaired loans, Unpaid Principal Balance	56	49
Impaired loans, Related Allowance	5	7
Commercial real estate: Construction [Member]
Summary of Impaired loans by loan class
Recorded Investment, With no related allowance recorded	104	106
Unpaid Principal Balance, With no related allowance recorded	151	151
Commercial real estate: Other [Member]
Summary of Impaired loans by loan class
Recorded Investment, With no related allowance recorded	2,790	4,488
Unpaid Principal Balance, With no related allowance recorded	5,281	7,500
Recorded Investment, With an allowance recorded	16,640	16,679
Unpaid Principal Balance, With an allowance recorded	16,640	16,679
Impaired Financing Receivable, With Related Allowance Related Allowance	2,198	1,218
Residential: 1-4 family [Member]
Summary of Impaired loans by loan class
Recorded Investment, With no related allowance recorded	6,235	8,204
Unpaid Principal Balance, With no related allowance recorded	9,438	11,745
Recorded Investment, With an allowance recorded	10,459	9,471
Unpaid Principal Balance, With an allowance recorded	11,979	10,106
Impaired Financing Receivable, With Related Allowance Related Allowance	1,409	1,119
Residential: Home equities [Member]
Summary of Impaired loans by loan class
Recorded Investment, With no related allowance recorded	298	353
Unpaid Principal Balance, With no related allowance recorded	500	548
Recorded Investment, With an allowance recorded	436	423
Unpaid Principal Balance, With an allowance recorded	436	423
Impaired Financing Receivable, With Related Allowance Related Allowance	46	46
Commercial real estate [Member]
Summary of Impaired loans by loan class
Impaired loans, Recorded Investment	19,534	21,273
Impaired loans, Unpaid Principal Balance	22,072	24,330
Impaired loans, Related Allowance	2,198	1,218
Residential [Member]
Summary of Impaired loans by loan class
Impaired loans, Recorded Investment	17,428	18,451
Impaired loans, Unpaid Principal Balance	22,353	22,822
Impaired loans, Related Allowance	$ 1,455	$ 1,165