Loans and Credit Quality - Newly Restructured Loans by Concession (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1	6
Pre-modification, total modification	$ 3,249	$ 2,051
Post-modification, number of contracts | contract	1	6
Post-modification, total modification	$ 2,031	$ 1,968
Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1	5
Pre-modification, total modification	$ 3,249	$ 1,859
Post-modification, number of contracts | contract	1	5
Post-modification, total modification	$ 2,031	$ 1,779
Real estate term owner occupied | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract		1
Pre-modification, total modification		$ 192
Post-modification, number of contracts | contract		1
Post-modification, total modification		$ 189
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Rate Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Rate Modification | Real estate term owner occupied | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification		0
Post-modification, total modification		0
Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	3,249	0
Post-modification, total modification	2,031	0
Term Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	3,249	0
Post-modification, total modification	2,031	0
Term Modification | Real estate term owner occupied | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification		0
Post-modification, total modification		0
Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	701
Post-modification, total modification	0	622
Payment Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	509
Post-modification, total modification	0	433
Payment Modification | Real estate term owner occupied | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification		192
Post-modification, total modification		189
Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	1,350
Post-modification, total modification	0	1,346
Combination Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	1,350
Post-modification, total modification	$ 0	1,346
Combination Modification | Real estate term owner occupied | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification		0
Post-modification, total modification		$ 0