Loans and Leases - Non-performing Loans and Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 12,820	$ 8,579
Purchased credit-impaired loans	0	167
Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,568	872
Home equity lines and loans
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,616	1,481
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,452	4,417
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,101	1,706
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	108	0
Leases
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	975	103
Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	9,061	3,745
Originated | Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	435	90
Originated | Home equity lines and loans
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,590	1,221
Originated | Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,813	1,505
Originated | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	1,786	826
Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	45	0
Originated | Leases
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	392	103
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,759	4,834
Acquired | Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,133	782
Acquired | Home equity lines and loans
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	26	260
Acquired | Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	639	2,912
Acquired | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	315	880
Acquired | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	63	0
Acquired | Leases
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 583	$ 0