Loans and Allowance for Loan and Lease Losses (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	$ 4,103	$ 4,119	$ 4,132	$ 4,212
Provision (credit) for losses	255	255	890	870
Charge-offs	(133)	(151)	(822)	(896)
Recoveries	11	6	36	43
Balance at end of period	4,236	4,229	4,236	4,229
Ending allowance balance: Individually evaluated for impairment	1,690		1,690		1,737
Ending allowance balance: Collectively evaluated for impairment	2,546		2,546		2,395
Ending loan balance: Individually evaluated for impairment	18,672		18,672		15,982
Ending loan balance: Collectively evaluated for impairment	295,396		295,396		301,105
Total	314,068		314,068		317,087
Commercial Real Estate Loans [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	773	674	584	639
Provision (credit) for losses	(234)	66	8	101
Charge-offs		(10)	(53)	(11)
Recoveries				1
Balance at end of period	539	730	539	730
Ending allowance balance: Individually evaluated for impairment	426		426		445
Ending allowance balance: Collectively evaluated for impairment	113		113		139
Ending loan balance: Individually evaluated for impairment	5,819		5,819		4,891
Ending loan balance: Collectively evaluated for impairment	97,609		97,609		95,235
Total	103,428		103,428		100,126
Residential Real Estate Loans [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	1,418	1,693	1,539	1,584
Provision (credit) for losses	165	56	356	329
Charge-offs	(50)	(107)	(367)	(298)
Recoveries	2	2	7	29
Balance at end of period	1,535	1,644	1,535	1,644
Ending allowance balance: Individually evaluated for impairment	462		462		707
Ending allowance balance: Collectively evaluated for impairment	1,073		1,073		832
Ending loan balance: Individually evaluated for impairment	6,675		6,675		6,440
Ending loan balance: Collectively evaluated for impairment	158,204		158,204		157,980
Total	164,879		164,879		164,420
Construction Real Estate Loans [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	954	859	1,150	1,254
Provision (credit) for losses	57	179	51	306
Charge-offs		(13)	(196)	(535)
Recoveries	1		7
Balance at end of period	1,012	1,025	1,012	1,025
Ending allowance balance: Individually evaluated for impairment	334		334		435
Ending allowance balance: Collectively evaluated for impairment	678		678		715
Ending loan balance: Individually evaluated for impairment	4,887		4,887		3,672
Ending loan balance: Collectively evaluated for impairment	10,830		10,830		14,308
Total	15,717		15,717		17,980
Commercial Loans and Leases [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	847	824	760	657
Provision (credit) for losses	253	(54)	427	112
Charge-offs	(65)		(154)
Recoveries	1		3	1
Balance at end of period	1,036	770	1,036	770
Ending allowance balance: Individually evaluated for impairment	453		453		142
Ending allowance balance: Collectively evaluated for impairment	583		583		618
Ending loan balance: Individually evaluated for impairment	1,242		1,242		935
Ending loan balance: Collectively evaluated for impairment	25,280		25,280		30,026
Total	26,522		26,522		30,961
Municipal Loans [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year
Provision (credit) for losses
Charge-offs
Recoveries
Balance at end of period
Ending allowance balance: Individually evaluated for impairment
Ending allowance balance: Collectively evaluated for impairment
Ending loan balance: Individually evaluated for impairment
Ending loan balance: Collectively evaluated for impairment	1,179		1,179		740
Total	1,179		1,179		740
Consumer Loans [Member]
Allowance for loan losses and recorded investment in loans and impairment methods
Balance at beginning of year	111	69	99	78
Provision (credit) for losses	14	8	48	22
Charge-offs	(18)	(21)	(52)	(52)
Recoveries	7	4	19	12
Balance at end of period	114	60	114	60
Ending allowance balance: Individually evaluated for impairment	15		15		8
Ending allowance balance: Collectively evaluated for impairment	99		99		91
Ending loan balance: Individually evaluated for impairment	49		49		44
Ending loan balance: Collectively evaluated for impairment	2,294		2,294		2,816
Total	$ 2,343		$ 2,343		$ 2,860