Allowance for Loan Losses, Loans and Allowance for Loan Losses Impairment Evaluations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Loan Losses [Abstract]
Commercial real estate mortgage loans to warrant information from management, minimum	$ 250
Loans to value ratio for originating residential mortgage and home equity loans, maximum (in hundredths)	80.00%
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	1,024	10,626
Ending balance: collectively evaluated for impairment	16,757	29,332
Balance, End of Period	17,781	39,958	28,419	12,333
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	26,956	135,100
Ending balance: collectively evaluated for impairment	753,824	834,554
Ending balance (loan portfolio)	780,780	969,654
Commercial and Industrial [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	340	7,477
Ending balance: collectively evaluated for impairment	6,917	17,603
Balance, End of Period	7,257	25,080	13,826
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	10,369	36,559
Ending balance: collectively evaluated for impairment	158,340	170,093
Ending balance (loan portfolio)	168,709	206,652
Commercial Real Estate [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	22	3,092
Ending balance: collectively evaluated for impairment	7,198	7,937
Balance, End of Period	7,220	11,029	9,226
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	9,443	66,402
Ending balance: collectively evaluated for impairment	359,828	362,244
Ending balance (loan portfolio)	369,271	428,646
Real Estate Construction [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	1	57
Ending balance: collectively evaluated for impairment	165	566
Balance, End of Period	166	623	3,177
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	1,961	19,251
Ending balance: collectively evaluated for impairment	13,508	30,453
Ending balance (loan portfolio)	15,469	49,704
Residential Mortgages (1st and 2nd Liens) [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	575	0
Ending balance: collectively evaluated for impairment	1,276	2,401
Balance, End of Period	1,851	2,401	519
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	4,660	8,345
Ending balance: collectively evaluated for impairment	141,915	152,274
Ending balance (loan portfolio)	146,575	160,619
Home Equity [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	86	0
Ending balance: collectively evaluated for impairment	979	512
Balance, End of Period	1,065	512	1,392
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	502	3,897
Ending balance: collectively evaluated for impairment	65,966	75,787
Ending balance (loan portfolio)	66,468	79,684
Consumer and Other Loans [Member]
Allowance for loan losses: [Abstract]
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	222	313
Balance, End of Period	222	313
Loan balances: [Abstract]
Ending balance: individually evaluated for impairment	21	646
Ending balance: collectively evaluated for impairment	14,267	43,703
Ending balance (loan portfolio)	$ 14,288	$ 44,349