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Loans - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) Contract | Dec. 31, 2018 USD ($) Contract | Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Period for order of valuations (at least) | 18 months |  |
Financing Receivable, Troubled Debt Restructuring | $ 4,016 |  | $ 6,434
Number of troubled debt restructured loan paid off | Contract | 1 | 1 |
Number of loans which has periodic late payments | Contract | 1 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts with Active Forbearance Agreements | 0 |  |
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process | $ 651 | $ 661 |
Residential mortgage and commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold period past due to discontinue accrual interest on financing receivable | 90 days |  |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold period past due for write-off of financing receivable (no later than) | 120 days |  |
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Period of financing receivable, updated valuation on real estate secured loans (number of days past due) | 90 days |  |
Number of previous months with no updated valuation completed for corporation to update valuation | 12 months |  |
Impaired financing receivable, valuation on real estate collateralized loans (number of days after the loan is classified as impaired) | 30 days |  |
Entity Loan Modification Program |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from paid off troubled debt restructured loans | $ 2,198 | $ 832 |
Maximum | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 20 years |  |
Loan-to-value ratio (no greater than) | 80.00% |  |
Maximum | Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 30 years |  |
Loan-to-value ratio (no greater than) | 80.00% |  |
Loan-to-value ratio that requires private mortgage insurance (in excess of) | 80.00% |  |
Maximum | Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 20 years |  |
Loan-to-value ratio (no greater than) | 90.00% |  |
Nonaccrual |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 207 |  | 2,527
Accrual |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 3,809 |  | $ 3,907

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