Loans (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Unpaid Principal Balance
Total with no related allowance recorded	$ 8,687		$ 8,687		$ 15,035
Total with an allowance recorded	6,535		6,535		7,303
Total	15,222		15,222		22,338
Recorded Investment
Total with no related allowance recorded	8,604		8,604		14,083
Total with an allowance recorded	6,442		6,442		5,561
Total	15,046	14,971	15,046	14,971	19,644
Total with an allowance recorded, Allowance for Loan Losses Allocated	3,402		3,402		2,740
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	16,714	15,781	17,691	16,492
Interest income during impairment				15
Cash-basis interest earned				15
Commercial
Unpaid Principal Balance
Total with no related allowance recorded	1,031		1,031		7,829
Total with an allowance recorded	4,487		4,487		3,678
Recorded Investment
Total with no related allowance recorded	948		948		6,978
Total with an allowance recorded	4,394		4,394		3,182
Total with an allowance recorded, Allowance for Loan Losses Allocated	2,588		2,588		1,963
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	6,736	11,034	7,877	11,341
Real estate | Commercial and residential
Unpaid Principal Balance
Total with no related allowance recorded	3,509		3,509		2,755
Total with an allowance recorded	1,560		1,560		3,183
Recorded Investment
Total with no related allowance recorded	3,509		3,509		2,741
Total with an allowance recorded	1,560		1,560		1,937
Total with an allowance recorded, Allowance for Loan Losses Allocated	480		480		465
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	5,286	2,252	5,083	2,214
Interest income during impairment				1
Cash-basis interest earned				1
Real estate | Land and construction
Unpaid Principal Balance
Total with no related allowance recorded	2,070		2,070		2,310
Total with an allowance recorded	59		59
Recorded Investment
Total with no related allowance recorded	2,070		2,070		2,223
Total with an allowance recorded	59		59
Total with an allowance recorded, Allowance for Loan Losses Allocated	12		12
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	2,153	2,210	2,177	2,733
Interest income during impairment				14
Cash-basis interest earned				14
Real estate | Home equity
Unpaid Principal Balance
Total with no related allowance recorded	2,077		2,077		2,141
Total with an allowance recorded	294		294		295
Recorded Investment
Total with no related allowance recorded	2,077		2,077		2,141
Total with an allowance recorded	294		294		295
Total with an allowance recorded, Allowance for Loan Losses Allocated	294		294		295
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	2,401	199	2,413	143
Consumer
Unpaid Principal Balance
Total with an allowance recorded	135		135		147
Recorded Investment
Total with an allowance recorded	135		135		147
Total with an allowance recorded, Allowance for Loan Losses Allocated	28		28		17
Average impaired loans with interest recognized and cash-basis interest earned on impaired loans
Average of impaired loans during the period	$ 138	$ 86	$ 141	$ 61