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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 11,781 | $ 16,624
Disbursements (Payments) | (676) | (81)
Charge offs |  | (379)
Payoffs | (197) | (3,006)
TDR ending balance | 10,908 | 13,158
TDR, Related Allowance | 492 | 757
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,118 | 3,298
Disbursements (Payments) | (38) | (20)
Reclassifications/Transfer In/(Out) |  | 154
TDR ending balance | 3,080 | 3,432
TDR, Related Allowance | 291 | 457
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Reclassifications/Transfer In/(Out) |  | 154
TDR ending balance |  | 154
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 83
TDR ending balance |  | 83
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 320 | 337
Disbursements (Payments) | (4) | (4)
TDR ending balance | 315 | 333
TDR, Related Allowance | 12 | 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 | 2,798 | 2,878
Disbursements (Payments) | (33) | (16)
TDR ending balance | 2,765 | 2,862
TDR, Related Allowance | 279 | 428
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 8,663 | 13,326
Disbursements (Payments) | (638) | (61)
Charge offs |  | (379)
Reclassifications/Transfer In/(Out) |  | (154)
Payoffs | (197) | (3,006)
TDR ending balance | 7,828 | 9,726
TDR, Related Allowance | 201 | 300
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,454 | 4,536
Disbursements (Payments) | (23) | (25)
Reclassifications/Transfer In/(Out) |  | (154)
Payoffs | (197) | (187)
TDR ending balance | 4,234 | 4,170
TDR, Related Allowance | 174 | 223
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) | (613) | (33)
Payoffs |  | (219)
TDR ending balance | 3,545 | 4,566
TDR, Related Allowance | 27 | 36
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) | (2) | (3)
Charge offs |  | (379)
Payoffs |  | (2,600)
TDR ending balance | $ 49 | 990
TDR, Related Allowance |  | $ 41

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