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Loans and Allowance for Loan Losses (Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment) (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 27 | 31 |
Recorded Investment | $ 3,629,000 | $ 4,406,000 |
Specific Reserve | $ 463,000 | $ 628,000 |
Number of Contracts | 2 | 3 | 5
Pre-Modification Outstanding Recorded Investment | $ 64,000 | $ 397,000 | $ 895,000
Post-Modification Outstanding Recorded Investment | 69,000 | 420,000 | 914,000
Specific Reserve | $ 15,000 | $ 95,000 | $ 45,000
Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 2 | 2 |
Recorded Investment | $ 338,000 | $ 347,000 |
Specific Reserve | $ 30,000 | $ 23,000 |
Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 2 | 2 |
Recorded Investment | $ 123,000 | $ 141,000 |
Specific Reserve | $ 0 | $ 0 |
Home equity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 1 | 2 |
Recorded Investment | $ 299,000 | $ 304,000 |
Specific Reserve | $ 69,000 | $ 162,000 |
Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 22 | 25 |
Recorded Investment | $ 2,869,000 | $ 3,614,000 |
Specific Reserve | $ 364,000 | 443,000 |
Home Equity Loan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Specific Reserve |  | $ 162,000 |
Maturity Concession | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 0 | 0 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 298,000
Post-Modification Outstanding Recorded Investment | 0 | 0 | 298,000
Specific Reserve | $ 0 | $ 0 | $ 15,000
Interest Rate Concession | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 134,000
Post-Modification Outstanding Recorded Investment | 0 | 0 | 145,000
Specific Reserve | $ 0 | $ 0 | $ 0
Interest Rate and Maturity Concession | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 2 | 2 | 1
Pre-Modification Outstanding Recorded Investment | $ 64,000 | $ 231,000 | $ 148,000
Post-Modification Outstanding Recorded Investment | 69,000 | 254,000 | 156,000
Specific Reserve | $ 15,000 | $ 50,000 | $ 30,000
Interest Rate and Maturity Concession | Home Equity Loan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 315,000
Post-Modification Outstanding Recorded Investment | 0 | 0 | 315,000
Specific Reserve | $ 0 | $ 0 | $ 0
Payment Deferral | Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | loan | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 166,000 | $ 0
Post-Modification Outstanding Recorded Investment | 0 | 166,000 | 0
Specific Reserve | $ 0 | $ 45,000 | $ 0

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