Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 12,531	$ 14,139
Current	911,872	915,886
Total ending loans balance	924,403	930,025	910,189
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	6,726	8,888
Current	412,654	416,504
Total ending loans balance	419,380	425,392	408,467
Recorded Investment greater than 90 Days and Accruing	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	684	201
Current	75,310	77,324
Total ending loans balance	75,994	77,525	83,297
Recorded Investment greater than 90 Days and Accruing	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,837	1,949
Current	69,550	69,547
Total ending loans balance	71,387	71,496	68,671
Recorded Investment greater than 90 Days and Accruing	0	0
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,328	2,087
Current	124,682	123,842
Total ending loans balance	127,010	125,929	122,824
Recorded Investment greater than 90 Days and Accruing	0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	697	509
Current	217,063	215,690
Total ending loans balance	217,760	216,199	209,694
Recorded Investment greater than 90 Days and Accruing		0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	259	505
Current	12,613	12,979
Total ending loans balance	12,872	13,484	17,236
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	2,832	4,519
30-59 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	923	3,026
30-59 Days Past Due | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	594	10
30-59 Days Past Due | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	368	431
30-59 Days Past Due | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	497	530
30-59 Days Past Due | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	420	287
30-59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	30	235
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,019	565
60-89 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,305	5
60-89 Days Past Due | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	94
60-89 Days Past Due | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	16	37
60-89 Days Past Due | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	409	315
60-89 Days Past Due | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	149	92
60-89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	140	22
90 Days and Greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	7,680	9,055
90 Days and Greater | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,498	5,857
90 Days and Greater | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	90	97
90 Days and Greater | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,453	1,481
90 Days and Greater | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,422	1,242
90 Days and Greater | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	128	130
90 Days and Greater | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 89	$ 248