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Loans and Allowance for Credit Losses on Loans (Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment) (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 25 | 27 |
Recorded Investment | $ 3,066,000 | $ 3,629,000 |
Specific Reserve | $ 401,000 | $ 463,000 |
Number of Contracts | 0 | 2 | 3
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 64,000 | $ 397,000
Post-Modification Outstanding Recorded Investment | 0 | 69,000 | 420,000
Specific Reserve | $ 0 | $ 15,000 | 95,000
Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 2 | 2 |
Recorded Investment | $ 328,000 | $ 338,000 |
Specific Reserve | $ 37,000 | $ 30,000 |
Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 2 | 2 |
Recorded Investment | $ 100,000 | $ 123,000 |
Specific Reserve | $ 0 | $ 0 |
Home equity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 1 |
Recorded Investment | $ 0 | $ 299,000 |
Specific Reserve | $ 0 | $ 69,000 |
Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 21 | 22 |
Recorded Investment | $ 2,638,000 | $ 2,869,000 |
Specific Reserve | $ 364,000 | $ 364,000 |
Home Equity Loan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Specific Reserve |  |  | $ 162,000
Interest Rate and Maturity Concession | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 2 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 64,000 | $ 231,000
Post-Modification Outstanding Recorded Investment | 0 | 69,000 | 254,000
Specific Reserve | $ 0 | $ 15,000 | $ 50,000
Payment Deferral | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 166,000
Post-Modification Outstanding Recorded Investment | 0 | 0 | 166,000
Specific Reserve | $ 0 | $ 0 | $ 45,000

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