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Loans and Allowance for Credit Losses (Effect on Loan Loss Provision as a Result of Changes in Methodology) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | $ 290 | $ 1,500 | $ 1,365 | $ 2,850
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | 77 | 456 | 127 | 778
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | (73) | 1,002 | 37 | 1,668
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | 2 | (126) | (197) | 295
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | 398 | 112 | 970 | 140
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses |  |  | $ 428 | $ (31)
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Provision for credit losses | $ (114) | $ 56 |  |

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