Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 10,535	$ 14,139
Current	923,303	915,886
Total ending loans balance	933,838	930,025
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	5,802	8,888
Current	416,949	416,504
Total ending loans balance	422,751	425,392
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	143	201
Current	76,285	77,324
Total ending loans balance	76,428	77,525
Recorded Investment greater than 90 Days and Accruing	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,877	1,949
Current	69,703	69,547
Total ending loans balance	71,580	71,496
Recorded Investment greater than 90 Days and Accruing	0	0
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,725	2,087
Current	126,141	123,842
Total ending loans balance	127,866	125,929
Recorded Investment greater than 90 Days and Accruing	0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	676	509
Current	220,192	215,690
Total ending loans balance	$ 220,868	216,199
Recorded Investment greater than 90 Days and Accruing		0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 312	505
Current	14,033	12,979
Total ending loans balance	14,345	13,484
Recorded Investment greater than 90 Days and Accruing	0	0
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,456	4,519
30-59 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	349	3,026
30-59 Days Past Due | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	47	10
30-59 Days Past Due | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	102	431
30-59 Days Past Due | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	384	530
30-59 Days Past Due | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	497	287
30-59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	77	235
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	664	565
60-89 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	108	5
60-89 Days Past Due | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	9	94
60-89 Days Past Due | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	360	37
60-89 Days Past Due | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	42	315
60-89 Days Past Due | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	132	92
60-89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	13	22
90 Days and Greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8,415	9,055
90 Days and Greater | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	5,345	5,857
90 Days and Greater | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	87	97
90 Days and Greater | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,415	1,481
90 Days and Greater | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,299	1,242
90 Days and Greater | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	47	130
90 Days and Greater | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 222	$ 248