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Loans (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | $ 12,000,000 |  | $ 12,000,000 |  | $ 11,100,000
Troubled Debt Restructuring, Classification removed |  | $ 335,000 | 0 | $ 2,000,000 |
Partial Charge-Offs On Impaired Loans |  |  | 9,946,000 |  | 24,943,000
Impaired Financing Receivable, Related Allowance | 5,102,000 |  | 5,102,000 |  | 548,000
Recorded investment, related to loans | 18,000,000 |  | 18,000,000 |  | 2,100,000
Troubled Debt Restructuring Included In Nonaccrual Loans | 42,100,000 |  | 42,100,000 |  | 46,900,000
TDRs included in accruing loan totals | 19,500,000 |  | 19,500,000 |  | 18,200,000
Nonaccrual Trouble Debt Restructuring Current | 35,600,000 |  | 35,600,000 |  | 38,000,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 500,000 |  | 500,000 |  | 700,000
Specific reserves related to troubled debt restructuring | 800,000 |  | 800,000 |  | 200,000
Additional Specific Reserves Related To Troubled Debt Restructuring | 0 | 0 | 290,000 | 975,000 |
Financing Receivable, Modifications, Recorded Investment, During Period | 4,938,000 | 12,422,000 | 10,765,000 | 18,779,000 |
Loan Modifications on Nonacrrual status | 500,000 | 7,600,000 | $ 3,000,000 | 8,500,000 |
Loan past due period before entering default status |  |  | 30 days |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 825,000 | 3,869,000 | $ 1,088,000 | 3,951,000 |
Deposit Liabilities Reclassified as Loans Receivable | 1,800,000 |  | 1,800,000 |  | 2,900,000
Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 7,500,000 |  | 24,700,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 2,400,000 |  | 200,000
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 1,455,000 | 1,777,000 | 2,320,000 | 5,118,000 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 72,000 | 808,000 | 248,000 | 808,000 |
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 | 320,000 |  | 320,000 |  | $ 309,000
Accruing [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 2,061,000 | 246,000 | 3,608,000 | 3,214,000 |
Loans modified during period | 0 | 14,000 | 2,000 | 14,000 |
Accruing [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 974,000 |  | 1,525,000 | 2,812,000 |
Nonaccrual [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 2,877,000 | 12,176,000 | 7,157,000 | 15,565,000 |
Loans modified during period |  | 3,900,000 | 1,100,000 | 3,900,000 |
Nonaccrual [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 481,000 | 1,777,000 | 795,000 | 2,306,000 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | 3,100,000 | 1,300,000 | 6,700,000 | 5,100,000 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period | $ 918,000 | $ 425,000 | $ 1,000,000 | $ 437,000 |

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