Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	$ 1,635	$ 5,376
60-89 Days Past Due	2,052	2,859
Greater than 90 Days	15,284	17,303
Total Past Due	18,971	25,538
Current	863,925	857,010
Total ending loans balance	882,896	882,548	867,459
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	33	3,681
60-89 Days Past Due	616	1,004
Greater than 90 Days	10,836	12,398
Total Past Due	11,485	17,083
Current	396,007	396,922
Total ending loans balance	407,492	414,005	398,251
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	85	0
Greater than 90 Days	213	376
Total Past Due	298	376
Current	73,969	68,329
Total ending loans balance	74,267	68,705	79,461
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	410	394
60-89 Days Past Due	388	1,094
Greater than 90 Days	3,181	2,827
Total Past Due	3,979	4,315
Current	62,218	60,668
Total ending loans balance	66,197	64,983	64,834
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	638	630
60-89 Days Past Due	841	494
Greater than 90 Days	940	1,510
Total Past Due	2,419	2,634
Current	117,904	120,196
Total ending loans balance	120,323	122,830	126,568
Recorded Investment greater than 90 Days and Accruing	0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	370	645
60-89 Days Past Due	82	227
Greater than 90 Days	18	69
Total Past Due	470	941
Current	202,016	198,983
Total ending loans balance	202,486	199,924	184,892
Recorded Investment greater than 90 Days and Accruing
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	184	26
60-89 Days Past Due	40	40
Greater than 90 Days	96	123
Total Past Due	320	189
Current	11,811	11,912
Total ending loans balance	12,131	12,101	13,453
Recorded Investment greater than 90 Days and Accruing	$ 0	$ 0