Loans and Loans Held for Sale - Restructured Loans By Segment and Type of Concession (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	8	11	21	20
Pre-Modification Outstanding Recorded Investment	$ 1,384	$ 1,369	$ 8,254	$ 8,349
Post-Modification Outstanding Recorded Investment	1,377	1,303	8,159	7,852
Bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	247	350	573	723
Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	80	0
Extend Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	1,130	851	1,926	7,027
Modify Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	5,433	0
Modify Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 102	$ 147	$ 102
Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 2,210
Post-Modification Outstanding Recorded Investment	0	0	0	2,210
Commercial real estate | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Forbearance | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	2,210
Commercial real estate | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	1	2	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 75	$ 6,304	$ 2,542
Post-Modification Outstanding Recorded Investment	0	75	6,229	2,143
Commercial and industrial | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial and industrial | Forbearance | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial and industrial | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	796	2,068
Commercial and industrial | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	5,433	0
Commercial and industrial | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 75	$ 0	$ 75
Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	2	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 701	$ 0	$ 2,592
Post-Modification Outstanding Recorded Investment	0	701	0	2,572
Commercial construction | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Forbearance | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	701	0	2,572
Commercial construction | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	4	1	5	1
Pre-Modification Outstanding Recorded Investment	$ 1,130	$ 93	$ 1,210	$ 93
Post-Modification Outstanding Recorded Investment	1,130	27	1,210	27
Business banking | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Business banking | Forbearance | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	80	0
Business banking | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	1,130	0	1,130	0
Business banking | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Business banking | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 27	$ 0	$ 27
Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	4	7	13	13
Pre-Modification Outstanding Recorded Investment	$ 254	$ 500	$ 739	$ 912
Post-Modification Outstanding Recorded Investment	247	500	720	900
Consumer real estate | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	247	350	573	723
Consumer real estate | Forbearance | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Consumer real estate | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	150	0	177
Consumer real estate | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Consumer real estate | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 147	$ 0
Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 1	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Forbearance | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0