Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for loan losses [Roll Forward]
Beginning balance	$ 35,713	$ 36,329	$ 35,933	$ 36,094	$ 36,094
Provision charged to expense	2,764	1,873	3,993	3,638	7,872
Losses charged off	(2,189)	(3,302)	(4,680)	(5,767)	(11,668)
Recoveries	845	797	1,887	1,732	3,635
Ending balance	37,133	35,697	37,133	35,697	35,933
Ending balance [Abstract]
Individually evaluated for impairment	1,319	1,337	1,319	1,337	1,313
Collectively evaluated for impairment	35,814	34,360	35,814	34,360	34,620
Loans ending balance [Abstract]
Individually evaluated for impairment	50,729	53,269	50,729	53,269	52,202
Collectively evaluated for impairment	3,036,613	2,878,116	3,036,613	2,878,116	2,886,169
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	644	1,983	884	2,199	2,199
Provision charged to expense	22	(534)	(220)	(754)	(1,035)
Losses charged off	0	(16)	(4)	(16)	(316)
Recoveries	3	4	9	8	36
Ending balance	669	1,437	669	1,437	884
Ending balance [Abstract]
Individually evaluated for impairment	25	287	25	287	213
Collectively evaluated for impairment	644	1,150	644	1,150	671
Loans ending balance [Abstract]
Individually evaluated for impairment	4,860	6,662	4,860	6,662	5,609
Collectively evaluated for impairment	67,194	62,351	67,194	62,351	61,389
Commercial [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,177	14,798	14,191	14,434	14,434
Provision charged to expense	1,435	664	1,624	1,140	1,220
Losses charged off	(318)	(1,029)	(528)	(1,186)	(1,641)
Recoveries	5	5	12	50	178
Ending balance	15,299	14,438	15,299	14,438	14,191
Ending balance [Abstract]
Individually evaluated for impairment	1,227	720	1,227	720	1,035
Collectively evaluated for impairment	14,072	13,718	14,072	13,718	13,156
Loans ending balance [Abstract]
Individually evaluated for impairment	32,240	32,848	32,240	32,848	33,756
Collectively evaluated for impairment	1,146,989	1,046,481	1,146,989	1,046,481	1,051,672
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	40	70	42	79	79
Provision charged to expense	(7)	24	(9)	15	(37)
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Ending balance	33	94	33	94	42
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	33	94	33	94	42
Loans ending balance [Abstract]
Individually evaluated for impairment	130	0	130	0	0
Collectively evaluated for impairment	4,773	7,353	4,773	7,353	5,512
Commercial [Member] | Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,736	4,247	4,656	4,225	4,225
Provision charged to expense	599	643	1,019	972	2,128
Losses charged off	(417)	(621)	(836)	(1,045)	(2,136)
Recoveries	75	161	154	278	439
Ending balance	4,993	4,430	4,993	4,430	4,656
Ending balance [Abstract]
Individually evaluated for impairment	67	330	67	330	65
Collectively evaluated for impairment	4,926	4,100	4,926	4,100	4,591
Loans ending balance [Abstract]
Individually evaluated for impairment	10,850	11,998	10,850	11,998	11,354
Collectively evaluated for impairment	341,323	354,975	341,323	354,975	338,805
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	571	548	629	550	550
Provision charged to expense	10	132	(48)	136	264
Losses charged off	0	(123)	0	(131)	(192)
Recoveries	0	1	0	3	7
Ending balance	581	558	581	558	629
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	581	558	581	558	629
Loans ending balance [Abstract]
Individually evaluated for impairment	846	0	846	0	0
Collectively evaluated for impairment	57,720	58,973	57,720	58,973	57,966
Residential [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,877	6,497	6,027	6,678	6,678
Provision charged to expense	(128)	16	(275)	110	291
Losses charged off	(97)	(171)	(164)	(483)	(1,043)
Recoveries	10	30	74	67	101
Ending balance	5,662	6,372	5,662	6,372	6,027
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	5,662	6,372	5,662	6,372	6,027
Loans ending balance [Abstract]
Individually evaluated for impairment	1,803	1,761	1,803	1,761	1,483
Collectively evaluated for impairment	706,664	706,699	706,664	706,699	701,486
Residential [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	757	824	774	839	839
Provision charged to expense	(11)	4	(27)	(4)	(20)
Losses charged off	0	(11)	(3)	(21)	(54)
Recoveries	1	2	3	5	9
Ending balance	747	819	747	819	774
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	747	819	747	819	774
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	93,721	89,185	93,721	89,185	91,511
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,844	1,603	1,885	1,594	1,594
Provision charged to expense	102	316	196	498	912
Losses charged off	(239)	(393)	(509)	(689)	(1,236)
Recoveries	159	108	294	231	615
Ending balance	1,866	1,634	1,866	1,634	1,885
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	1,866	1,634	1,866	1,634	1,885
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	135,228	129,291	135,228	129,291	133,093
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	7,067	5,759	6,845	5,496	5,496
Provision charged to expense	742	608	1,733	1,525	4,149
Losses charged off	(1,118)	(938)	(2,636)	(2,196)	(5,050)
Recoveries	592	486	1,341	1,090	2,250
Ending balance	7,283	5,915	7,283	5,915	6,845
Ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	7,283	5,915	7,283	5,915	6,845
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	$ 483,001	$ 422,808	$ 483,001	$ 422,808	$ 444,735