Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Allowance for loan losses [Roll Forward]
Beginning balance	$ 35,933	$ 36,094	$ 36,094
Provision charged to expense	1,229	1,765	7,872
Losses charged off	(2,491)	(2,465)	(11,668)
Recoveries	1,042	935	3,635
Ending balance	35,713	36,329	35,933
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	952	2,666	1,313
Collectively evaluated for impairment	34,761	33,663	34,620
Loans ending balance [Abstract]
Individually evaluated for impairment	50,300	59,542	52,202
Collectively evaluated for impairment	2,919,565	2,829,749	2,886,169
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	884	2,199	2,199
Provision charged to expense	(242)	(220)	(1,035)
Losses charged off	(4)	0	(316)
Recoveries	6	4	36
Ending balance	644	1,983	884
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	25	746	213
Collectively evaluated for impairment	619	1,237	671
Loans ending balance [Abstract]
Individually evaluated for impairment	5,119	7,556	5,609
Collectively evaluated for impairment	64,658	67,230	61,389
Commercial [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,191	14,434	14,434
Provision charged to expense	189	477	1,220
Losses charged off	(210)	(158)	(1,641)
Recoveries	7	45	178
Ending balance	14,177	14,798	14,191
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	927	1,588	1,035
Collectively evaluated for impairment	13,250	13,210	13,156
Loans ending balance [Abstract]
Individually evaluated for impairment	32,452	37,417	33,756
Collectively evaluated for impairment	1,070,534	1,026,245	1,051,672
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	42	79	79
Provision charged to expense	(2)	(9)	(37)
Losses charged off	0	0	0
Recoveries	0	0	0
Ending balance	40	70	42
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	40	70	42
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	5,443	7,463	5,512
Commercial [Member] | Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,656	4,225	4,225
Provision charged to expense	419	328	2,128
Losses charged off	(419)	(423)	(2,136)
Recoveries	80	117	439
Ending balance	4,736	4,247	4,656
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	332	65
Collectively evaluated for impairment	4,736	3,915	4,591
Loans ending balance [Abstract]
Individually evaluated for impairment	10,927	12,551	11,354
Collectively evaluated for impairment	339,579	339,677	338,805
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	629	550	550
Provision charged to expense	(58)	4	264
Losses charged off	0	(8)	(192)
Recoveries	0	2	7
Ending balance	571	548	629
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	571	548	629
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	55,746	61,830	57,966
Residential [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	6,027	6,678	6,678
Provision charged to expense	(148)	94	291
Losses charged off	(66)	(312)	(1,043)
Recoveries	64	37	101
Ending balance	5,877	6,497	6,027
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	5,877	6,497	6,027
Loans ending balance [Abstract]
Individually evaluated for impairment	1,802	2,018	1,483
Collectively evaluated for impairment	702,753	703,864	701,486
Residential [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	774	839	839
Provision charged to expense	(15)	(7)	(20)
Losses charged off	(4)	(11)	(54)
Recoveries	2	3	9
Ending balance	757	824	774
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	757	824	774
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	91,330	88,521	91,511
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,885	1,594	1,594
Provision charged to expense	94	182	912
Losses charged off	(270)	(295)	(1,236)
Recoveries	135	122	615
Ending balance	1,844	1,603	1,885
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,844	1,603	1,885
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	132,201	126,154	133,093
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	6,845	5,496	5,496
Provision charged to expense	992	916	4,149
Losses charged off	(1,518)	(1,258)	(5,050)
Recoveries	748	605	2,250
Ending balance	7,067	5,759	6,845
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	7,067	5,759	6,845
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 457,321	$ 408,765	$ 444,735