- 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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 17,815	$ 17,300	$ 17,637	$ 17,063
Losses charged off	(1,354)	(1,681)	(4,449)	(5,378)
Recoveries	380	93	1,253	460
Provision charged to expense	950	1,875	3,350	5,442
Balance, end of period	17,791	17,587	17,791	17,587
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,547	2,596	1,547	2,596
Collectively evaluated for impairment	16,244	14,991	16,244	14,991
Total ending allowance balance	17,791	17,587	17,791	17,587
Loans:
Individually evaluated for impairment	23,856	26,829	23,856	26,829
Collectively evaluated for impairment	867,444	858,886	867,444	858,886
Total ending loans balance	891,300	885,715	891,300	885,715	882,548
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	10,424	11,396	11,386	10,714
Losses charged off	(630)	(738)	(1,475)	(2,057)
Recoveries	83	9	584	39
Provision charged to expense	585	1,093	(33)	3,064
Balance, end of period	10,462	11,760	10,462	11,760
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,462	2,525	1,462	2,525
Collectively evaluated for impairment	9,000	9,235	9,000	9,235
Total ending allowance balance	10,462	11,760	10,462	11,760
Loans:
Individually evaluated for impairment	20,148	25,310	20,148	25,310
Collectively evaluated for impairment	383,883	386,614	383,883	386,614
Total ending loans balance	404,031	411,924	404,031	411,924	414,005
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	438	840	835	1,409
Losses charged off	0	(48)	(120)	(213)
Recoveries	2	4	7	24
Provision charged to expense	36	(42)	(246)	(466)
Balance, end of period	476	754	476	754
Ending allowance balance attributable to loans:
Individually evaluated for impairment	79	69	79	69
Collectively evaluated for impairment	397	685	397	685
Total ending allowance balance	476	754	476	754
Loans:
Individually evaluated for impairment	588	340	588	340
Collectively evaluated for impairment	79,225	71,582	79,225	71,582
Total ending loans balance	79,813	71,922	79,813	71,922	68,705
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	1,606	1,716	1,559	1,331
Losses charged off	(35)	(292)	(679)	(1,267)
Recoveries	178	3	277	86
Provision charged to expense	(311)	274	281	1,551
Balance, end of period	1,438	1,701	1,438	1,701
Ending allowance balance attributable to loans:
Individually evaluated for impairment	6	2	6	2
Collectively evaluated for impairment	1,432	1,699	1,432	1,699
Total ending allowance balance	1,438	1,701	1,438	1,701
Loans:
Individually evaluated for impairment	1,670	1,179	1,670	1,179
Collectively evaluated for impairment	63,727	67,370	63,727	67,370
Total ending loans balance	65,397	68,549	65,397	68,549	64,983
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	3,508	2,146	2,357	2,289
Losses charged off	(410)	(296)	(1,439)	(851)
Recoveries	5	16	60	31
Provision charged to expense	405	264	2,530	661
Balance, end of period	3,508	2,130	3,508	2,130
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	3,508	2,130	3,508	2,130
Total ending allowance balance	3,508	2,130	3,508	2,130
Loans:
Individually evaluated for impairment	1,107	0	1,107	0
Collectively evaluated for impairment	121,178	125,108	121,178	125,108
Total ending loans balance	122,285	125,108	122,285	125,108	122,830
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	1,581	985	1,230	891
Losses charged off	(196)	(161)	(555)	(738)
Recoveries	104	54	276	244
Provision charged to expense	122	134	660	615
Balance, end of period	1,611	1,012	1,611	1,012
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	1,611	1,012	1,611	1,012
Total ending allowance balance	1,611	1,012	1,611	1,012
Loans:
Individually evaluated for impairment	191	0	191	0
Collectively evaluated for impairment	206,158	195,358	206,158	195,358
Total ending loans balance	206,349	195,358	206,349	195,358	199,924
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	258	217	270	429
Losses charged off	(83)	(146)	(181)	(252)
Recoveries	8	7	49	36
Provision charged to expense	113	152	158	17
Balance, end of period	296	230	296	230
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	296	230	296	230
Total ending allowance balance	296	230	296	230
Loans:
Individually evaluated for impairment	152	0	152	0
Collectively evaluated for impairment	13,273	12,854	13,273	12,854
Total ending loans balance	$ 13,425	$ 12,854	$ 13,425	$ 12,854	$ 12,101