Loans and Leases - Allowance for Loan and Leases Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	$ 19,426	$ 17,525
Charge-offs	(2,844)	(953)
Recoveries	298	60
Provision for loan and lease losses	3,736	1,030
Balance	20,616	17,662
Commercial mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	7,567	7,550
Charge-offs	(1,388)	0
Recoveries	15	3
Provision for loan and lease losses	2,047	(379)
Balance	8,241	7,174
Home equity loans and lines
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	1,003	1,086
Charge-offs	(47)	(25)
Recoveries	1	0
Provision for loan and lease losses	81	(16)
Balance	1,038	1,045
Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	1,813	1,926
Charge-offs	(331)	0
Recoveries	1	0
Provision for loan and lease losses	408	(28)
Balance	1,891	1,898
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	1,485	937
Charge-offs	0	0
Recoveries	1	1
Provision for loan and lease losses	(300)	(94)
Balance	1,186	844
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	5,461	5,038
Charge-offs	(405)	(283)
Recoveries	15	0
Provision for loan and lease losses	817	606
Balance	5,888	5,361
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	229	246
Charge-offs	(105)	(49)
Recoveries	11	1
Provision for loan and lease losses	193	93
Balance	328	291
Leases
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	1,868	742
Charge-offs	(568)	(596)
Recoveries	254	55
Provision for loan and lease losses	490	848
Balance	2,044	1,049
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance	0	0
Charge-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	0	0
Balance	$ 0	$ 0