Allowance for Loan and Lease Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Allowance for loan losses [Roll Forward]
Beginning balance	$ 33,617	$ 33,601	$ 34,008	$ 33,245	$ 33,245
Provision charged to expense	3,300	2,129	5,380	7,349	8,568
Losses charged off	3,470	2,519	7,644	8,822	11,049
Recoveries	643	802	2,346	2,241	3,244
Ending balance	34,090	34,013	34,090	34,013	34,008
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	2,218	3,280	2,218	3,280	2,296
Collectively evaluated for impairment	31,872	30,733	31,872	30,733	31,712
Loans Ending balance: [Abstract]
Individually evaluated for impairment	66,911	63,292	66,911	63,292	65,300
Collectively evaluated for impairment	2,616,994	2,553,073	2,616,994	2,553,073	2,550,054
Commercial Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	2,916	3,835	3,396	4,033	4,033
Provision charged to expense	84	(101)	(406)	806	189
Losses charged off	0	0	0	1,112	1,135
Recoveries	15	151	25	158	309
Ending balance	3,015	3,885	3,015	3,885	3,396
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	734	1,827	734	1,827	1,189
Collectively evaluated for impairment	2,281	2,058	2,281	2,058	2,207
Loans Ending balance: [Abstract]
Individually evaluated for impairment	9,399	10,143	9,399	10,143	9,810
Collectively evaluated for impairment	110,849	97,797	110,849	97,797	100,969
Commercial Secured by Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,402	14,162	14,535	13,541	13,541
Provision charged to expense	1,255	448	1,489	2,064	2,438
Losses charged off	834	477	1,452	1,495	1,607
Recoveries	12	13	263	36	163
Ending balance	14,835	14,146	14,835	14,146	14,535
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	1,273	1,295	1,273	1,295	1,005
Collectively evaluated for impairment	13,562	12,851	13,562	12,851	13,530
Loans Ending balance: [Abstract]
Individually evaluated for impairment	39,080	36,477	39,080	36,477	39,297
Collectively evaluated for impairment	892,375	841,458	892,375	841,458	833,245
Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	102	117	121	126	126
Provision charged to expense	25	3	6	(6)	(5)
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Ending balance	127	120	127	120	121
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	127	120	127	120	121
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	10,055	9,380	10,055	9,380	8,840
Commercial Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,677	4,793	5,238	5,469	5,469
Provision charged to expense	959	551	1,059	937	1,477
Losses charged off	1,169	464	2,074	1,768	2,265
Recoveries	154	102	398	344	557
Ending balance	4,621	4,982	4,621	4,982	5,238
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	211	158	211	158	102
Collectively evaluated for impairment	4,410	4,824	4,410	4,824	5,136
Loans Ending balance: [Abstract]
Individually evaluated for impairment	16,558	15,644	16,558	15,644	15,169
Collectively evaluated for impairment	330,477	360,842	330,477	360,842	359,712
Real Estate Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	450	368	397	376	376
Provision charged to expense	(6)	59	161	89	106
Losses charged off	7	49	123	87	89
Recoveries	0	4	2	4	4
Ending balance	437	382	437	382	397
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	437	382	437	382	397
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	62,105	53,545	62,105	53,545	56,075
Real Estate Mortgage [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,142	4,950	4,939	4,767	4,767
Provision charged to expense	8	202	412	648	860
Losses charged off	216	216	437	498	744
Recoveries	10	11	30	30	56
Ending balance	4,944	4,947	4,944	4,947	4,939
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	4,944	4,947	4,944	4,947	4,939
Loans Ending balance: [Abstract]
Individually evaluated for impairment	1,874	1,028	1,874	1,028	1,024
Collectively evaluated for impairment	701,449	692,781	701,449	692,781	696,577
Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	643	576	601	563	563
Provision charged to expense	42	73	110	250	268
Losses charged off	65	62	93	235	241
Recoveries	1	1	3	10	11
Ending balance	621	588	621	588	601
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	621	588	621	588	601
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	88,291	82,498	88,291	82,498	84,880
Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,597	1,134	1,127	1,102	1,102
Provision charged to expense	216	272	1,031	611	696
Losses charged off	298	336	980	927	1,166
Recoveries	96	105	433	389	495
Ending balance	1,611	1,175	1,611	1,175	1,127
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	1,611	1,175	1,611	1,175	1,127
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	121,367	123,960	121,367	123,960	122,215
Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,688	3,666	3,654	3,268	3,268
Provision charged to expense	717	622	1,518	1,950	2,539
Losses charged off	881	915	2,485	2,700	3,802
Recoveries	355	415	1,192	1,270	1,649
Ending balance	3,879	3,788	3,879	3,788	3,654
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	3,879	3,788	3,879	3,788	3,654
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	$ 300,026	$ 290,812	$ 300,026	$ 290,812	$ 287,541