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Loans - Modification Statuses by Portfolio Segment (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 64 | 78 | 74
Percentage of loans receivable, by type | 100.00% | 100.00% | 100.00%
Balance | $ | $ 1,617,212 | $ 1,436,646 | $ 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 | $ | $ 234,334 |  |
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 | 156 |  |
Percentage of loans receivable, by type | 26.00% |  |
Balance | $ | $ 35,130 |  |
Percentage of balance | 15.00% |  |
Commercial/Municipal Loan Modifications | Charged Off | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 1 |  |
Percentage of loans receivable, by type | 0.00% |  |
Balance | $ | $ 66 |  |
Percentage of balance | 0.00% |  |
Commercial/Municipal Loan Modifications | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 2 |  |
Percentage of loans receivable, by type | 0.00% |  |
Balance | $ | $ 1,014 |  |
Percentage of balance | 0.00% |  |
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 | 1 |  |
Percentage of loans receivable, by type | 0.00% |  |
Balance | $ | $ 125 |  |
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 | 445 |  |
Percentage of loans receivable, by type | 74.00% |  |
Balance | $ | $ 197,999 |  |
Percentage of balance | 85.00% |  |
Residential Real Estate Modifications | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 377 |  |
Percentage of loans receivable, by type | 100.00% |  |
Balance | $ | $ 52,578 |  |
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 | 73 |  |
Percentage of loans receivable, by type | 20.00% |  |
Balance | $ | $ 12,694 |  |
Percentage of balance | 24.00% |  |
Residential Real Estate Modifications | Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 53 |  |
Percentage of loans receivable, by type | 14.00% |  |
Balance | $ | $ 5,405 |  |
Percentage of balance | 10.00% |  |
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 | 1 |  |
Percentage of loans receivable, by type | 0.00% |  |
Balance | $ | $ 22 |  |
Percentage of balance | 0.00% |  |
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 | 250 |  |
Percentage of loans receivable, by type | 66.00% |  |
Balance | $ | $ 34,457 |  |
Percentage of balance | 66.00% |  |
Consumer Loan Modifications |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 1 | 1 | 1
Percentage of loans receivable, by type | 1.40% | 1.90% | 1.80%
Balance | $ | $ 23,333 | $ 27,323 | $ 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 | $ | $ 1,010 |  |
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 | 23 |  |
Percentage of loans receivable, by type | 34.00% |  |
Balance | $ | $ 209 |  |
Percentage of balance | 21.00% |  |
Consumer Loan Modifications | Charged Off | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Units | loan | 1 |  |
Percentage of loans receivable, by type | 1.00% |  |
Balance | $ | $ 10 |  |
Percentage of balance | 1.00% |  |
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 | 43 |  |
Percentage of loans receivable, by type | 62.00% |  |
Balance | $ | $ 748 |  |
Percentage of balance | 74.00% |  |

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