Loans and Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	$ 181,504	$ 169,735
Total gross loans, net of deferred fees, After one but within five years	312,933	295,556
Total gross loans, net of deferred fees, After five years	193,045	180,658
Total gross loans, net of deferred fees	687,482	645,949
Loans maturing after one year with fixed interest rates	338,246	314,396
Loans maturing after one year with floating interest rates	167,732	161,818
Commercial [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	145,937	138,238
Total gross loans, net of deferred fees, After one but within five years	253,766	245,666
Total gross loans, net of deferred fees, After five years	82,051	74,565
Total gross loans, net of deferred fees	481,754	458,469
Commercial [Member] | Owner occupied RE [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	26,479	23,833
Total gross loans, net of deferred fees, After one but within five years	107,023	92,681
Total gross loans, net of deferred fees, After five years	47,755	42,276
Total gross loans, net of deferred fees	181,257	158,790
Commercial [Member] | Non-owner occupied RE [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	49,855	47,252
Total gross loans, net of deferred fees, After one but within five years	89,356	98,514
Total gross loans, net of deferred fees, After five years	21,875	19,397
Total gross loans, net of deferred fees	161,086	165,163
Commercial [Member] | Construction [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	8,227	9,206
Total gross loans, net of deferred fees, After one but within five years	9,266	4,387
Total gross loans, net of deferred fees, After five years	5,405	6,754
Total gross loans, net of deferred fees	22,898	20,347
Commercial [Member] | Business [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	61,376	57,947
Total gross loans, net of deferred fees, After one but within five years	48,121	50,084
Total gross loans, net of deferred fees, After five years	7,016	6,138
Total gross loans, net of deferred fees	116,513	114,169
Consumer [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	35,567	31,497
Total gross loans, net of deferred fees, After one but within five years	59,167	49,890
Total gross loans, net of deferred fees, After five years	110,994	106,093
Total gross loans, net of deferred fees	205,728	187,480
Consumer [Member] | Real estate [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	17,417	12,907
Total gross loans, net of deferred fees, After one but within five years	30,330	27,702
Total gross loans, net of deferred fees, After five years	49,425	45,950
Total gross loans, net of deferred fees	97,172	86,559
Consumer [Member] | Home equity [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	4,332	7,083
Total gross loans, net of deferred fees, After one but within five years	22,453	17,832
Total gross loans, net of deferred fees, After five years	56,078	52,980
Total gross loans, net of deferred fees	82,863	77,895
Consumer [Member] | Construction [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	8,233	6,032
Total gross loans, net of deferred fees, After one but within five years	1,422	1,530
Total gross loans, net of deferred fees, After five years	4,374	6,187
Total gross loans, net of deferred fees	14,029	13,749
Consumer [Member] | Other [Member]
Loan maturity distribution by type and related interest rate
Total gross loans, net of deferred fees, One year or less	5,585	5,475
Total gross loans, net of deferred fees, After one but within five years	4,962	2,826
Total gross loans, net of deferred fees, After five years	1,117	976
Total gross loans, net of deferred fees	$ 11,664	$ 9,277