Loans and Leases - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2019 USD ($) contract	Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings | $	$ 9,331	$ 9,331	$ 10,962
Number of contracts	5	6
Pre-Modification Outstanding Recorded Investment | $	$ 1,128	$ 1,154
Post-Modification Outstanding Recorded Investment | $	$ 1,128	$ 1,154
Loan Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Interest Rate Change and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Interest Rate Change and/or Interest-Only Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	2	2
Contractual Payment Reduction (Leases only)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	2
Temporary Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Home equity loans and lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Pre-Modification Outstanding Recorded Investment | $	$ 64	$ 64
Post-Modification Outstanding Recorded Investment | $	$ 64	$ 64
Home equity loans and lines | Loan Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Home equity loans and lines | Interest Rate Change and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Home equity loans and lines | Interest Rate Change and/or Interest-Only Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Home equity loans and lines | Contractual Payment Reduction (Leases only)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Home equity loans and lines | Temporary Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Pre-Modification Outstanding Recorded Investment | $	$ 40	$ 40
Post-Modification Outstanding Recorded Investment | $	$ 40	$ 40
Residential mortgage | Loan Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	1
Residential mortgage | Interest Rate Change and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Residential mortgage | Interest Rate Change and/or Interest-Only Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Residential mortgage | Contractual Payment Reduction (Leases only)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Residential mortgage | Temporary Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	2	2
Pre-Modification Outstanding Recorded Investment | $	$ 919	$ 919
Post-Modification Outstanding Recorded Investment | $	$ 919	$ 919
Commercial and industrial | Loan Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Commercial and industrial | Interest Rate Change and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Commercial and industrial | Interest Rate Change and/or Interest-Only Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	2	2
Commercial and industrial | Contractual Payment Reduction (Leases only)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Commercial and industrial | Temporary Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Leases
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	2
Pre-Modification Outstanding Recorded Investment | $	$ 105	$ 131
Post-Modification Outstanding Recorded Investment | $	$ 105	$ 131
Leases | Loan Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Leases | Interest Rate Change and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Leases | Interest Rate Change and/or Interest-Only Period
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Leases | Contractual Payment Reduction (Leases only)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	1	2
Leases | Temporary Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts	0	0
Nonperforming Financial Instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings | $	$ 4,190	$ 4,190	1,217
Performing Financial Instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings | $	$ 5,141	$ 5,141	$ 9,745