Loans and Leases - Non-performing Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 12,179	$ 12,820
Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	8,354	9,061
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,825	3,759
Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	6,072	2,568
Commercial mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,324	435
Commercial mortgage | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	2,748	2,133
Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	49	3,616
Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	49	3,590
Home equity loans and lines | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	0	26
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	701	3,452
Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	695	2,813
Residential mortgage | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	6	639
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	4,495	2,101
Commercial and industrial | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	3,785	1,786
Commercial and industrial | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	710	315
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	60	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	24	63
Leases
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	802	975
Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	465	392
Leases | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans and leases	$ 337	$ 583