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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 16,624 | $ 18,504
New TDRs |  | 345
Disbursements (payments) | (161) | (1,119)
Charge offs | (379) | (89)
Reclassifications/transfer in/(out) |  | (108)
Payoffs | (3,056) | (584)
TDR ending balance | 13,028 | 16,949
TDR, related allowance | 421 | 923
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,298 | 5,504
New TDRs |  | 345
Disbursements (payments) | (44) | (916)
Reclassifications/transfer in/(out) | 154 | (108)
TDR ending balance | 3,408 | 4,825
TDR, related allowance | 421 | 690
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 1,603
Disbursements (payments) |  | (44)
Reclassifications/transfer in/(out) | 154 |
TDR ending balance | 154 | 1,559
TDR, related allowance |  | 110
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 83 | 83
TDR ending balance | 83 | 83
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 337 |
New TDRs |  | 345
Disbursements (payments) | (4) |
TDR ending balance | 333 | 345
TDR, related allowance | 29 |
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 | 2,878 | 3,818
Disbursements (payments) | (40) | (872)
Reclassifications/transfer in/(out) |  | (108)
TDR ending balance | 2,838 | 2,838
TDR, related allowance | 392 | 580
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 13,326 | 13,000
Disbursements (payments) | (117) | (203)
Charge offs | (379) | (89)
Reclassifications/transfer in/(out) | (154) |
Payoffs | (3,056) | (584)
TDR ending balance | 9,620 | 12,124
TDR, related allowance |  | 233
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,536 | 3,875
Disbursements (payments) | (42) | (102)
Charge offs |  | (89)
Reclassifications/transfer in/(out) | (154) |
Payoffs | (237) | (450)
TDR ending balance | 4,103 | 3,234
TDR, related allowance |  | 145
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,818 | 4,936
Disbursements (payments) | (69) | (83)
Payoffs | (219) |
TDR ending balance | 4,530 | 4,853
TDR, related allowance |  | 75
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 | 3,972 | 4,189
Disbursements (payments) | (6) | (18)
Charge offs | (379) |
Payoffs | (2,600) | (134)
TDR ending balance | $ 987 | 4,037
TDR, related allowance |  | $ 13

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