Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses [Roll Forward]
Beginning balance	$ 36,094	$ 34,447	$ 34,008
Provision charged to expense	7,872	8,650	8,755
Losses charged off	(11,668)	(9,870)	(11,436)
Recoveries	3,635	2,867	3,120
Ending balance	35,933	36,094	34,447
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	1,313	2,461	1,742
Collectively evaluated for impairment	34,620	33,633	32,705
Loans ending balance [Abstract]
Individually evaluated for impairment	52,202	49,888	59,068
Collectively evaluated for impairment	2,886,169	2,824,073	2,674,756
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	2,199	2,896	3,396
Provision charged to expense	(1,035)	(707)	(513)
Losses charged off	(316)	(3)	(15)
Recoveries	36	13	28
Ending balance	884	2,199	2,896
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	213	831	734
Collectively evaluated for impairment	671	1,368	2,162
Loans ending balance [Abstract]
Individually evaluated for impairment	5,609	6,263	9,627
Collectively evaluated for impairment	61,389	71,757	112,315
Commercial [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,434	13,618	14,535
Provision charged to expense	1,220	2,135	941
Losses charged off	(1,641)	(1,379)	(2,163)
Recoveries	178	60	305
Ending balance	14,191	14,434	13,618
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	1,035	1,227	827
Collectively evaluated for impairment	13,156	13,207	12,791
Loans ending balance [Abstract]
Individually evaluated for impairment	33,756	33,421	34,357
Collectively evaluated for impairment	1,051,672	1,019,498	914,269
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	79	119	121
Provision charged to expense	(37)	(40)	(2)
Losses charged off	0	0	0
Recoveries	0	0	0
Ending balance	42	79	119
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	42	79	119
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	5,512	8,514	10,344
Commercial [Member] | Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,225	4,263	5,238
Provision charged to expense	2,128	1,338	1,545
Losses charged off	(2,136)	(1,961)	(3,141)
Recoveries	439	585	621
Ending balance	4,656	4,225	4,263
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	65	403	181
Collectively evaluated for impairment	4,591	3,822	4,082
Loans ending balance [Abstract]
Individually evaluated for impairment	11,354	8,460	13,807
Collectively evaluated for impairment	338,805	350,438	338,241
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	550	534	397
Provision charged to expense	264	147	258
Losses charged off	(192)	(135)	(123)
Recoveries	7	4	2
Ending balance	629	550	534
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	629	550	534
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	57,966	61,750	62,412
Residential [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	6,678	6,094	4,939
Provision charged to expense	291	1,888	2,173
Losses charged off	(1,043)	(1,421)	(1,058)
Recoveries	101	117	40
Ending balance	6,027	6,678	6,094
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,027	6,678	6,094
Loans ending balance [Abstract]
Individually evaluated for impairment	1,483	1,744	1,277
Collectively evaluated for impairment	701,486	706,130	711,188
Residential [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	839	756	601
Provision charged to expense	(20)	158	265
Losses charged off	(54)	(129)	(115)
Recoveries	9	54	5
Ending balance	774	839	756
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	774	839	756
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	91,511	89,450	88,335
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,594	1,574	1,127
Provision charged to expense	912	891	1,207
Losses charged off	(1,236)	(1,306)	(1,326)
Recoveries	615	435	566
Ending balance	1,885	1,594	1,574
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,885	1,594	1,574
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	133,093	126,406	122,136
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,496	4,593	3,654
Provision charged to expense	4,149	2,840	2,881
Losses charged off	(5,050)	(3,536)	(3,495)
Recoveries	2,250	1,599	1,553
Ending balance	6,845	5,496	4,593
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,845	5,496	4,593
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 444,735	$ 390,130	$ 315,516