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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 11,781 | $ 16,624
New TDRs | 41 |
Disbursements (Payments) | (2,273) | (935)
Charge offs | (3) | (477)
Reclassifications/Transfer In/(Out) |  | (74)
Payoffs | (353) | (3,357)
TDR ending balance | 9,193 | 11,781
TDR, Related Allowance | 312 | 556
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,118 | 3,298
Disbursements (Payments) | (1,423) | (180)
Charge offs | (3) | (80)
Reclassifications/Transfer In/(Out) |  | 80
TDR ending balance | 1,692 | 3,118
TDR, Related Allowance | 113 | 336
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Charge offs |  | (80)
Reclassifications/Transfer In/(Out) | 1,393 | 80
TDR ending balance | 1,393 |
TDR, Related Allowance | 113 |
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 83
Reclassifications/Transfer In/(Out) |  | (83)
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 320 | 337
Disbursements (Payments) | (21) | (17)
TDR ending balance | 299 | 320
TDR, Related Allowance |  | 16
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 2,798 | 2,878
Disbursements (Payments) | (1,402) | (163)
Charge offs | (3) |
Reclassifications/Transfer In/(Out) | (1,393) | 83
TDR ending balance |  | 2,798
TDR, Related Allowance |  | 320
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 8,663 | 13,326
New TDRs | 41 |
Disbursements (Payments) | (850) | (755)
Charge offs |  | (397)
Reclassifications/Transfer In/(Out) |  | (154)
Payoffs | (353) | (3,357)
TDR ending balance | 7,501 | 8,663
TDR, Related Allowance | 199 | 220
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,454 | 4,536
New TDRs | 41 |
Disbursements (Payments) | (101) | (85)
Reclassifications/Transfer In/(Out) |  | 541
Payoffs | (353) | (538)
TDR ending balance | 4,041 | 4,454
TDR, Related Allowance | 180 | 183
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,158 | 4,818
Disbursements (Payments) | (739) | (441)
Payoffs |  | (219)
TDR ending balance | 3,419 | 4,158
TDR, Related Allowance | 19 | 37
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 51 | 3,972
Disbursements (Payments) | (10) | (229)
Charge offs |  | (397)
Reclassifications/Transfer In/(Out) |  | (695)
Payoffs |  | (2,600)
TDR ending balance | $ 41 | $ 51

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