Loans Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Recorded Investment [Abstract]
With No Related Allowance	$ 2,809	$ 3,864	$ 3,866
With a Related Allowance	0		1,387
Unpaid Principal Balance [Abstract]
With No Related Allowance	2,809	4,031	4,033
With a Related Allowance	0		1,387
Average Recorded Balance [Abstract]
With No Related Allowance	3,339	3,929
With a Related Allowance	694
Interest Income Recognized [Abstract]
With No Related Allowance	7	43
With a Related Allowance	72
Cash Basis Income [Abstract]
With No Related Allowance	0	38
With a Related Allowance	72
Commercial [Member]
Recorded Investment [Abstract]
With No Related Allowance	37	62	45
With a Related Allowance	0		1,387
Unpaid Principal Balance [Abstract]
With No Related Allowance	37	62	45
With a Related Allowance	0		1,387
Average Recorded Balance [Abstract]
With No Related Allowance	41	65
With a Related Allowance	694
Interest Income Recognized [Abstract]
With No Related Allowance	1	2
With a Related Allowance	72
Cash Basis Income [Abstract]
With No Related Allowance	0	0
With a Related Allowance	72
Commercial Construction [Member]
Recorded Investment [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0		0
Unpaid Principal Balance [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0		0
Average Recorded Balance [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Commercial Real Estate [Member]
Recorded Investment [Abstract]
With No Related Allowance	1,505	1,454	2,528
With a Related Allowance	0		0
Unpaid Principal Balance [Abstract]
With No Related Allowance	1,505	1,621	2,695
With a Related Allowance	0		0
Average Recorded Balance [Abstract]
With No Related Allowance	2,017	1,584
With a Related Allowance	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	38
With a Related Allowance	0
Cash Basis Income [Abstract]
With No Related Allowance	0	38
With a Related Allowance	0
Other Consumer [Member]
Recorded Investment [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0		0
Unpaid Principal Balance [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0		0
Average Recorded Balance [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Automobile [Member]
Recorded Investment [Abstract]
With No Related Allowance	182	240	203
With a Related Allowance	0		0
Unpaid Principal Balance [Abstract]
With No Related Allowance	182	240	203
With a Related Allowance	0		0
Average Recorded Balance [Abstract]
With No Related Allowance	193	172
With a Related Allowance	0
Interest Income Recognized [Abstract]
With No Related Allowance	2	2
With a Related Allowance	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0
With a Related Allowance	0
Residential [Member]
Recorded Investment [Abstract]
With No Related Allowance	1,085	2,108	1,090
With a Related Allowance	0		0
Unpaid Principal Balance [Abstract]
With No Related Allowance	1,085	2,108	1,090
With a Related Allowance	0		0
Average Recorded Balance [Abstract]
With No Related Allowance	1,088	2,108
With a Related Allowance	0
Interest Income Recognized [Abstract]
With No Related Allowance	4	1
With a Related Allowance	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0
With a Related Allowance	$ 0