- Summary of Activity in the Loan Balances and the Allowance for Loan Losses by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 17,637	$ 17,063
Losses charged off	(1,428)	(2,076)
Recoveries	247	228
Provision charged to expense	1,350	1,900
Balance, end of period	17,806	17,115
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,970	3,817
Collectively evaluated for impairment	15,836	13,298
Total ending allowance balance	17,806	17,115
Loans:
Individually evaluated for impairment	27,137	31,199
Collectively evaluated for impairment	862,794	831,021
Total ending loans balance	889,931	862,220	882,548
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	11,386	10,714
Losses charged off	(123)	(979)
Recoveries	7	20
Provision charged to expense	(486)	1,896
Balance, end of period	10,784	11,651
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,778	3,635
Collectively evaluated for impairment	9,006	8,016
Total ending allowance balance	10,784	11,651
Loans:
Individually evaluated for impairment	23,941	29,328
Collectively evaluated for impairment	391,812	381,453
Total ending loans balance	415,753	410,781	414,005
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	835	1,409
Losses charged off	(63)	0
Recoveries	4	17
Provision charged to expense	(242)	(841)
Balance, end of period	534	585
Ending allowance balance attributable to loans:
Individually evaluated for impairment	192	145
Collectively evaluated for impairment	342	440
Total ending allowance balance	534	585
Loans:
Individually evaluated for impairment	564	592
Collectively evaluated for impairment	75,345	72,865
Total ending loans balance	75,909	73,457	68,705
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	1,559	1,331
Losses charged off	(513)	(467)
Recoveries	64	67
Provision charged to expense	554	643
Balance, end of period	1,664	1,574
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	37
Collectively evaluated for impairment	1,664	1,537
Total ending allowance balance	1,664	1,574
Loans:
Individually evaluated for impairment	1,991	1,279
Collectively evaluated for impairment	62,495	59,733
Total ending loans balance	64,486	61,012	64,983
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	2,357	2,289
Losses charged off	(436)	(403)
Recoveries	47	4
Provision charged to expense	980	408
Balance, end of period	2,948	2,298
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,948	2,298
Total ending allowance balance	2,948	2,298
Loans:
Individually evaluated for impairment	483	0
Collectively evaluated for impairment	121,281	125,298
Total ending loans balance	121,764	125,298	122,830
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	1,230	891
Losses charged off	(216)	(178)
Recoveries	94	103
Provision charged to expense	502	(9)
Balance, end of period	1,610	807
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,610	807
Total ending allowance balance	1,610	807
Loans:
Individually evaluated for impairment	99	0
Collectively evaluated for impairment	199,865	178,433
Total ending loans balance	199,964	178,433	199,924
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	270	429
Losses charged off	(77)	(49)
Recoveries	31	17
Provision charged to expense	42	(197)
Balance, end of period	266	200
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	266	200
Total ending allowance balance	266	200
Loans:
Individually evaluated for impairment	59	0
Collectively evaluated for impairment	11,996	13,239
Total ending loans balance	$ 12,055	$ 13,239	$ 12,101