Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	$ 3,474	$ 5,376
60-89 Days Past Due	1,166	2,859
Greater than 90 Days	13,646	17,303
Total Past Due	18,286	25,538
Current	873,014	857,010
Total ending loans balance	891,300	882,548	885,715
Recorded Investment greater than 90 Days and Accruing	0	184
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	20	3,681
60-89 Days Past Due	50	1,004
Greater than 90 Days	9,610	12,398
Total Past Due	9,680	17,083
Current	394,351	396,922
Total ending loans balance	404,031	414,005	411,924
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	1,567	0
60-89 Days Past Due	109	0
Greater than 90 Days	234	376
Total Past Due	1,910	376
Current	77,903	68,329
Total ending loans balance	79,813	68,705	71,922
Recorded Investment greater than 90 Days and Accruing	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	377	394
60-89 Days Past Due	586	1,094
Greater than 90 Days	2,587	2,827
Total Past Due	3,550	4,315
Current	61,847	60,668
Total ending loans balance	65,397	64,983	68,549
Recorded Investment greater than 90 Days and Accruing	0	184
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	1,094	630
60-89 Days Past Due	362	494
Greater than 90 Days	1,065	1,510
Total Past Due	2,521	2,634
Current	119,764	120,196
Total ending loans balance	122,285	122,830	125,108
Recorded Investment greater than 90 Days and Accruing	0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	225	645
60-89 Days Past Due	59	227
Greater than 90 Days	41	69
Total Past Due	325	941
Current	206,024	198,983
Total ending loans balance	206,349	199,924	195,358
Recorded Investment greater than 90 Days and Accruing
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	191	26
60-89 Days Past Due	0	40
Greater than 90 Days	109	123
Total Past Due	300	189
Current	13,125	11,912
Total ending loans balance	13,425	12,101	12,854
Recorded Investment greater than 90 Days and Accruing	$ 0	$ 0