Loans and Allowance for Loan Losses - Summary of Recorded Investment Based on Delinquency Status (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	$ 933,838	$ 930,025
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	422,751	425,392
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	76,428	77,525
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	71,580	71,496
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	127,866	125,929
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	220,868	216,199
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ending loans balance	14,345	13,484
Commercial Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	484,260	483,366
Total loans internally credit risk graded	504,265	509,266
Total loans not internally credit risk graded	429,573	420,759
Total ending loans balance	933,838	930,025
Commercial Credit Exposure | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	10	66
Commercial Credit Exposure | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	5,461	5,121
Commercial Credit Exposure | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	9,441	8,693
Commercial Credit Exposure | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	405,323	364,548
Commercial Credit Exposure | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	64,025	104,938
Commercial Credit Exposure | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	6,890	6,554
Commercial Credit Exposure | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	13,115	19,346
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	425,470	416,154
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	1,060	1,282
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	354	466
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	2,689	2,857
Commercial Credit Exposure | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	407,739	404,937
Total loans internally credit risk graded	422,751	425,392
Total loans not internally credit risk graded	0	0
Total ending loans balance	422,751	425,392
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	600	600
Commercial Credit Exposure | Commercial real estate | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	7,035	8,576
Commercial Credit Exposure | Commercial real estate | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	339,190	301,225
Commercial Credit Exposure | Commercial real estate | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	60,914	94,536
Commercial Credit Exposure | Commercial real estate | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	3,111	2,365
Commercial Credit Exposure | Commercial real estate | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	11,901	18,090
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	72,479	73,173
Total loans internally credit risk graded	76,428	77,525
Total loans not internally credit risk graded	0	0
Total ending loans balance	76,428	77,525
Commercial Credit Exposure | Commercial | Grade 1-Minimal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	10	66
Commercial Credit Exposure | Commercial | Grade 2-Modest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	4,861	4,521
Commercial Credit Exposure | Commercial | Grade 3-Better than average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	2,406	117
Commercial Credit Exposure | Commercial | Grade 4-Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	62,403	60,074
Commercial Credit Exposure | Commercial | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	2,799	8,395
Commercial Credit Exposure | Commercial | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	3,756	4,163
Commercial Credit Exposure | Commercial | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	193	189
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	4,042	5,256
Total loans internally credit risk graded	5,086	6,349
Total loans not internally credit risk graded	66,494	65,147
Total ending loans balance	71,580	71,496
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	3,730	3,249
Commercial Credit Exposure | Residential Real Estate | Grade 5-Acceptable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Pass Credits	312	2,007
Commercial Credit Exposure | Residential Real Estate | Grade 6-Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	23	26
Commercial Credit Exposure | Residential Real Estate | Grade 7-Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans internally credit risk graded	1,021	1,067
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	65,104	63,643
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	102	230
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	167	37
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	1,121	1,237
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	127,866	125,929
Total ending loans balance	127,866	125,929
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	126,141	123,842
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	384	530
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	42	315
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	1,299	1,242
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	220,868	216,199
Total ending loans balance	220,868	216,199
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	220,192	215,690
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	497	287
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	132	92
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	47	130
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	14,345	13,484
Total ending loans balance	14,345	13,484
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	14,033	12,979
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	235
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	13	22
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	$ 222	$ 248