Loan Portfolio and Credit Quality Nonaccrual Loans by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	$ 24,314	$ 16,103
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	1,371	582
Commercial tax-exempt
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	0	0
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	5,392	0
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	16,074	13,993
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	1,476	1,525
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loan receivable	$ 1	$ 3