Loans and Leases - Non-performing Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 19,283	$ 12,820
Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	15,751	9,061
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,532	3,759
Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	5,558	2,568
Commercial mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,458	435
Commercial mortgage | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,100	2,133
Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	6,904	3,616
Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	6,878	3,590
Home equity loans and lines | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	26	26
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,863	3,452
Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,293	2,813
Residential mortgage | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	570	639
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,965	2,101
Commercial and industrial | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,657	1,786
Commercial and industrial | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	308	315
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	80	108
Consumer | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	36	45
Consumer | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	44	63
Leases
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	913	975
Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	429	392
Leases | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 484	$ 583