Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Allowance for loan losses [Roll Forward]
Beginning balance	$ 36,094	$ 34,447	$ 34,447
Provision charged to expense	1,765	1,901	8,650
Losses charged off	(2,465)	(2,636)	(9,870)
Recoveries	935	894	2,867
Ending balance	36,329	34,606	36,094
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	2,666	1,787	2,461
Collectively evaluated for impairment	33,663	32,819	33,633
Loans ending balance [Abstract]
Individually evaluated for impairment	59,542	56,464	49,888
Collectively evaluated for impairment	2,829,749	2,690,018	2,824,073
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	2,199	2,896	2,896
Provision charged to expense	(220)	(34)	(707)
Losses charged off	0	(1)	(3)
Recoveries	4	3	13
Ending balance	1,983	2,864	2,199
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	746	734	831
Collectively evaluated for impairment	1,237	2,130	1,368
Loans ending balance [Abstract]
Individually evaluated for impairment	7,556	9,143	6,263
Collectively evaluated for impairment	67,230	110,079	71,757
Commercial [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,434	13,618	13,618
Provision charged to expense	477	630	2,135
Losses charged off	(158)	(433)	(1,379)
Recoveries	45	45	60
Ending balance	14,798	13,860	14,434
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	1,588	869	1,227
Collectively evaluated for impairment	13,210	12,991	13,207
Loans ending balance [Abstract]
Individually evaluated for impairment	37,417	32,828	33,421
Collectively evaluated for impairment	1,026,245	933,507	1,019,498
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	79	119	119
Provision charged to expense	(9)	6	(40)
Losses charged off	0	0	0
Recoveries	0	0	0
Ending balance	70	125	79
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	70	125	79
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	7,463	10,908	8,514
Commercial [Member] | Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,225	4,263	4,263
Provision charged to expense	328	55	1,338
Losses charged off	(423)	(441)	(1,961)
Recoveries	117	248	585
Ending balance	4,247	4,125	4,225
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	332	184	403
Collectively evaluated for impairment	3,915	3,941	3,822
Loans ending balance [Abstract]
Individually evaluated for impairment	12,551	13,593	8,460
Collectively evaluated for impairment	339,677	327,807	350,438
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	550	534	534
Provision charged to expense	4	75	147
Losses charged off	(8)	(90)	(135)
Recoveries	2	0	4
Ending balance	548	519	550
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	548	519	550
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	61,830	60,894	61,750
Residential [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	6,678	6,094	6,094
Provision charged to expense	94	364	1,888
Losses charged off	(312)	(438)	(1,421)
Recoveries	37	10	117
Ending balance	6,497	6,030	6,678
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,497	6,030	6,678
Loans ending balance [Abstract]
Individually evaluated for impairment	2,018	900	1,744
Collectively evaluated for impairment	703,864	707,167	706,130
Residential [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	839	756	756
Provision charged to expense	(7)	17	158
Losses charged off	(11)	(42)	(129)
Recoveries	3	11	54
Ending balance	824	742	839
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	824	742	839
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	88,521	87,136	89,450
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,594	1,574	1,574
Provision charged to expense	182	200	891
Losses charged off	(295)	(357)	(1,306)
Recoveries	122	104	435
Ending balance	1,603	1,521	1,594
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,603	1,521	1,594
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	126,154	120,005	126,406
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,496	4,593	4,593
Provision charged to expense	916	588	2,840
Losses charged off	(1,258)	(834)	(3,536)
Recoveries	605	473	1,599
Ending balance	5,759	4,820	5,496
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	5,759	4,820	5,496
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 408,765	$ 332,515	$ 390,130