Loans, Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
With no related allowance recorded [Abstract]
Recorded Investment	$ 10,014	$ 9,978
Unpaid Principal Balance	10,602	10,373
Average Recorded Investment	10,110	10,705
Interest Income Recognized	92	400
With an allowance recorded [Abstract]
Recorded Investment	5,474	5,180
Unpaid Principal Balance	5,696	6,035
Related Allowance	885	904
Average Recorded Investment	5,521	5,850
Interest Income Recognized	35	173
Total [Abstract]
Recorded Investment	15,488	15,158
Unpaid Principal Balance	16,298	16,408
Related Allowance	885	904
Average Recorded Investment	15,631	16,555
Interest Income Recognized	127	573
Commercial and Industrial [Member]
With no related allowance recorded [Abstract]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	975
Interest Income Recognized	0	43
With an allowance recorded [Abstract]
Recorded Investment	181	264
Unpaid Principal Balance	249	822
Related Allowance	71	159
Average Recorded Investment	202	374
Interest Income Recognized	0	0
Total [Abstract]
Recorded Investment	181	264
Unpaid Principal Balance	249	822
Related Allowance	71	159
Average Recorded Investment	202	1,349
Interest Income Recognized	0	43
Commercial Secured By Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	9,480	9,541
Unpaid Principal Balance	9,875	9,936
Average Recorded Investment	9,516	9,310
Interest Income Recognized	89	350
With an allowance recorded [Abstract]
Recorded Investment	4,526	4,258
Unpaid Principal Balance	4,654	4,360
Related Allowance	657	660
Average Recorded Investment	4,548	4,765
Interest Income Recognized	32	171
Total [Abstract]
Recorded Investment	14,006	13,799
Unpaid Principal Balance	14,529	14,296
Related Allowance	657	660
Average Recorded Investment	14,064	14,075
Interest Income Recognized	121	521
Residential Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	534	417
Unpaid Principal Balance	727	417
Average Recorded Investment	591	397
Interest Income Recognized	3	5
With an allowance recorded [Abstract]
Recorded Investment	760	658
Unpaid Principal Balance	786	853
Related Allowance	157	85
Average Recorded Investment	764	707
Interest Income Recognized	3	2
Total [Abstract]
Recorded Investment	1,294	1,075
Unpaid Principal Balance	1,513	1,270
Related Allowance	157	85
Average Recorded Investment	1,355	1,104
Interest Income Recognized	6	7
Consumer [Member]
With no related allowance recorded [Abstract]
Recorded Investment	0	20
Unpaid Principal Balance	0	20
Average Recorded Investment	3	23
Interest Income Recognized	0	2
With an allowance recorded [Abstract]
Recorded Investment	7	0
Unpaid Principal Balance	7	0
Related Allowance	0	0
Average Recorded Investment	7	4
Interest Income Recognized	0	0
Total [Abstract]
Recorded Investment	7	20
Unpaid Principal Balance	7	20
Related Allowance	0	0
Average Recorded Investment	10	27
Interest Income Recognized	$ 0	$ 2