Loans and Credit Quality - Newly Restructured Loans by Concession (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	2	6
Pre-modification, total modification	$ 3,413	$ 2,051
Post-modification, number of contracts | contract	2	6
Post-modification, total modification	$ 1,728	$ 1,953
Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	2	5
Pre-modification, total modification	$ 3,413	$ 1,859
Post-modification, number of contracts | contract	2	5
Post-modification, total modification	$ 1,728	$ 1,765
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		$ 188
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	1,565	0
Term Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	3,249	0
Post-modification, total modification	1,565	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	164	701
Post-modification, total modification	163	613
Payment Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	164	509
Post-modification, total modification	163	425
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		188
Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	1,350
Post-modification, total modification	0	1,340
Combination Modification | Commercial | AQR Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	1,350
Post-modification, total modification	$ 0	1,340
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