Loans and Allowance for Loan Losses - Summary of Recorded Investment Based on Delinquency Status (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	$ 907,365	$ 902,299
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	405,585	401,591
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	85,575	88,646
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	67,369	66,507
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	123,248	123,076
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	212,702	206,323
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	12,886	16,156
Commercial Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	470,456	467,759
Total loans internally credit risk graded	498,017	497,099
Total loans not internally credit risk graded	409,348	405,200
Total ending loans balance	907,365	902,299
Commercial Credit Exposure | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	71	52
Commercial Credit Exposure | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	39	37
Commercial Credit Exposure | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	1,229	857
Commercial Credit Exposure | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	100,910	23,464
Commercial Credit Exposure | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	368,207	443,349
Commercial Credit Exposure | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	3,108	5,072
Commercial Credit Exposure | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	24,453	24,268
Commercial Credit Exposure | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	403,840	398,444
Commercial Credit Exposure | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	1,113	1,511
Commercial Credit Exposure | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	807	1,722
Commercial Credit Exposure | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	3,588	3,523
Commercial Credit Exposure | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	382,048	376,218
Total loans internally credit risk graded	405,585	401,591
Total loans not internally credit risk graded	0	0
Total ending loans balance	405,585	401,591
Commercial Credit Exposure | Commercial real estate | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Commercial real estate | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Commercial real estate | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	1,229	857
Commercial Credit Exposure | Commercial real estate | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	80,085	22,580
Commercial Credit Exposure | Commercial real estate | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	300,734	352,781
Commercial Credit Exposure | Commercial real estate | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	2,788	2,146
Commercial Credit Exposure | Commercial real estate | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	20,749	23,227
Commercial Credit Exposure | Commercial real estate | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Commercial real estate | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Commercial real estate | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial real estate | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial real estate | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial real estate | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	82,565	85,339
Total loans internally credit risk graded	85,575	88,646
Total loans not internally credit risk graded	0	0
Total ending loans balance	85,575	88,646
Commercial Credit Exposure | Commercial | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	71	52
Commercial Credit Exposure | Commercial | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	39	37
Commercial Credit Exposure | Commercial | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Commercial | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	20,425	271
Commercial Credit Exposure | Commercial | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	62,030	84,979
Commercial Credit Exposure | Commercial | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	81	2,891
Commercial Credit Exposure | Commercial | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	2,929	416
Commercial Credit Exposure | Commercial | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Commercial | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Commercial | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Commercial | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	0	0
Commercial Credit Exposure | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	5,843	6,202
Total loans internally credit risk graded	6,857	6,862
Total loans not internally credit risk graded	60,512	59,645
Total ending loans balance	67,369	66,507
Commercial Credit Exposure | Residential Real Estate | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Residential Real Estate | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Residential Real Estate | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Residential Real Estate | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	400	613
Commercial Credit Exposure | Residential Real Estate | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	5,443	5,589
Commercial Credit Exposure | Residential Real Estate | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	239	35
Commercial Credit Exposure | Residential Real Estate | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	775	625
Commercial Credit Exposure | Residential Real Estate | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Residential Real Estate | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Residential Real Estate | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	57,775	56,390
Commercial Credit Exposure | Residential Real Estate | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	333	64
Commercial Credit Exposure | Residential Real Estate | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	508	960
Commercial Credit Exposure | Residential Real Estate | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	1,896	2,231
Commercial Credit Exposure | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Total loans internally credit risk graded	0	0
Total loans not internally credit risk graded	123,248	123,076
Total ending loans balance	123,248	123,076
Commercial Credit Exposure | Home equity loans | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Home equity loans | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Home equity loans | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Home equity loans | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Home equity loans | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Home equity loans | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Home equity loans | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Home equity loans | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Home equity loans | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Home equity loans | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	121,121	120,359
Commercial Credit Exposure | Home equity loans | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	434	932
Commercial Credit Exposure | Home equity loans | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	130	707
Commercial Credit Exposure | Home equity loans | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	1,563	1,078
Commercial Credit Exposure | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Total loans internally credit risk graded	0	0
Total loans not internally credit risk graded	212,702	206,323
Total ending loans balance	212,702	206,323
Commercial Credit Exposure | Indirect | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Indirect | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Indirect | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Indirect | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Indirect | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Indirect | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Indirect | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Indirect | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Indirect | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Indirect | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	212,322	205,938
Commercial Credit Exposure | Indirect | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	269	332
Commercial Credit Exposure | Indirect | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	89	30
Commercial Credit Exposure | Indirect | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	22	23
Commercial Credit Exposure | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Total loans internally credit risk graded	0	0
Total loans not internally credit risk graded	12,886	16,156
Total ending loans balance	12,886	16,156
Commercial Credit Exposure | Consumer | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Consumer | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Consumer | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Consumer | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Consumer | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	0	0
Commercial Credit Exposure | Consumer | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Consumer | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Consumer | Grade 8-Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Consumer | Grade 9-Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	0	0
Commercial Credit Exposure | Consumer | Current loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	12,622	15,757
Commercial Credit Exposure | Consumer | 30-59 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	77	183
Commercial Credit Exposure | Consumer | 60-89 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	80	25
Commercial Credit Exposure | Consumer | 90 days past due loans not internally risk graded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans not internally credit risk graded	$ 107	$ 191