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Loans (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | $ 12,300,000 |  | $ 12,300,000 |  | $ 12,200,000
Troubled Debt Restructuring, Classification removed | 1,900,000 |  | 2,200,000 | $ 0 |
Partial Charge-Offs On Impaired Loans |  |  | 11,384,000 |  | 10,040,000
Impaired Financing Receivable, Related Allowance | 1,396,000 |  | 1,396,000 |  | 684,000
Recorded investment, related to loans | 5,300,000 |  | 5,300,000 |  | 3,500,000
Troubled Debt Restructuring Included In Nonaccrual Loans | 23,900,000 |  | 23,900,000 |  | 38,500,000
TDRs included in accruing loan totals | 16,400,000 |  | 16,400,000 |  | 20,200,000
Nonaccrual Trouble Debt Restructuring Current | 18,100,000 |  | 18,100,000 |  | 32,400,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 600,000 |  | 600,000 |  | 1,300,000
Specific reserves related to troubled debt restructuring | 500,000 |  | 500,000 |  |
Additional Specific Reserves Related To Troubled Debt Restructuring | 0 | $ 10,000 | 10,000 | 290,000 |
Financing Receivable, Modifications, Recorded Investment, During Period | 2,374,000 | 3,036,000 | 3,767,000 | 7,569,000 |
Loan Modifications on Nonacrrual status | 5,000 | 175,000 | $ 400,000 | 2,800,000 |
Loan past due period before entering default status |  |  | 30 days |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 1,235,000 | 2,110,000 | $ 1,380,000 | 2,326,000 |
Deposit Liabilities Reclassified as Loans Receivable | 1,000,000 |  | 1,000,000 |  | 1,900,000
Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 9,200,000 |  | 7,900,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 2,200,000 |  |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 589,000 | 802,000 | 720,000 | 1,183,000 |
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 27,000 |  | 27,000 |  | $ 2,000
Accruing [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 1,223,000 | 1,477,000 | 1,511,000 | 1,725,000 |
Loans modified during period | 21,000 | 13,000 | 21,000 | 13,000 |
Accruing [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 455,000 | 802,000 | 455,000 | 803,000 |
Nonaccrual [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 1,151,000 | 1,559,000 | 2,256,000 | 5,844,000 |
Loans modified during period | 1,200,000 | 2,100,000 | 1,400,000 | 2,300,000 |
Nonaccrual [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 134,000 |  | 265,000 | 380,000 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 4,700,000 | 3,400,000 | 11,000,000 | 5,000,000 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | $ 100,000 | $ 0 | $ 200,000 | $ 100,000 |

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