Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Analysis of changes in the allowance for loan losses
Balance at beginning of period	$ 3,825	$ 3,058
Loan charge-offs	(176)	(214)
Recoveries	42	25
Net loan charge-offs	(134)	(189)
Provision charged to operations	200	270
Balance at end of period	3,891	3,139
Commercial
Analysis of changes in the allowance for loan losses
Balance at beginning of period	639	565
Loan charge-offs	(1)	(17)
Recoveries	4	2
Net loan charge-offs	3	(15)
Provision charged to operations	(23)	(16)
Balance at end of period	619	534
Commercial real estate
Analysis of changes in the allowance for loan losses
Balance at beginning of period	2,616	1,803
Loan charge-offs	(72)
Net loan charge-offs	(72)
Provision charged to operations	194	(148)
Balance at end of period	2,738	1,655
Consumer - other
Analysis of changes in the allowance for loan losses
Balance at beginning of period	104	92
Loan charge-offs	(29)	(46)
Recoveries	32	15
Net loan charge-offs	3	(31)
Provision charged to operations	(14)	60
Balance at end of period	93	121
Consumer - home equity
Analysis of changes in the allowance for loan losses
Balance at beginning of period	123	128
Loan charge-offs		(51)
Recoveries	5	2
Net loan charge-offs	5	(49)
Provision charged to operations	(21)	112
Balance at end of period	107	191
Residential real estate
Analysis of changes in the allowance for loan losses
Balance at beginning of period	343	470
Loan charge-offs	(74)	(100)
Recoveries	1	6
Net loan charge-offs	(73)	(94)
Provision charged to operations	64	262
Balance at end of period	$ 334	$ 638