Loans - Modification Statuses by Portfolio Segment (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	72	78	74
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Balance \| $	$ 1,588,264	$ 1,451,623	$ 1,476,761
Commercial/Municipal Loan Modifications \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	605
Percentage of loans receivable, by type	100.00%
Balance \| $	$ 237,697
Percentage of balance	100.00%
Commercial/Municipal Loan Modifications \| Paid Off \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	121
Percentage of loans receivable, by type	20.00%
Balance \| $	$ 19,750
Percentage of balance	8.00%
Commercial/Municipal Loan Modifications \| Subsequent Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	13
Percentage of loans receivable, by type	2.00%
Balance \| $	$ 7,800
Percentage of balance	3.00%
Commercial/Municipal Loan Modifications \| Still in Original Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	2
Percentage of loans receivable, by type	0.00%
Balance \| $	$ 228
Percentage of balance	0.00%
Commercial/Municipal Loan Modifications \| Out of Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	469
Percentage of loans receivable, by type	78.00%
Balance \| $	$ 209,919
Percentage of balance	89.00%
Residential Real Estate Modifications \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	376
Percentage of loans receivable, by type	100.00%
Balance \| $	$ 52,912
Percentage of balance	100.00%
Residential Real Estate Modifications \| Paid Off \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	57
Percentage of loans receivable, by type	15.00%
Balance \| $	$ 10,535
Percentage of balance	20.00%
Residential Real Estate Modifications \| Subsequent Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	115
Percentage of loans receivable, by type	30.00%
Balance \| $	$ 13,320
Percentage of balance	25.00%
Residential Real Estate Modifications \| Still in Original Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	6
Percentage of loans receivable, by type	2.00%
Balance \| $	$ 574
Percentage of balance	1.00%
Residential Real Estate Modifications \| Out of Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	198
Percentage of loans receivable, by type	53.00%
Balance \| $	$ 28,483
Percentage of balance	54.00%
Consumer Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	1	0	1
Percentage of loans receivable, by type	1.50%	1.90%	1.80%
Balance \| $	$ 24,358	$ 28,269	$ 25,857
Consumer Loan Modifications \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	69
Percentage of loans receivable, by type	100.00%
Balance \| $	$ 1,059
Percentage of balance	100.00%
Consumer Loan Modifications \| Paid Off \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	21
Percentage of loans receivable, by type	30.00%
Balance \| $	$ 179
Percentage of balance	17.00%
Consumer Loan Modifications \| Subsequent Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	2
Percentage of loans receivable, by type	3.00%
Balance \| $	$ 43
Percentage of balance	4.00%
Consumer Loan Modifications \| Out of Modification \| Exemption from Troubled Debt Restructure Designation, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Units \| loan	46
Percentage of loans receivable, by type	67.00%
Balance \| $	$ 837
Percentage of balance	79.00%