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Loans (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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   $ 917,000 0 $ 1,700,000  
Partial Charge-Offs On Impaired Loans     9,130,000   24,943,000
Impaired Financing Receivable, Related Allowance 4,145,000   4,145,000   548,000
Recorded investment, related to loans 18,000,000   18,000,000   2,100,000
Troubled Debt Restructuring Included In Nonaccrual Loans 43,900,000   43,900,000   46,900,000
TDRs included in accruing loan totals 18,700,000   18,700,000   18,200,000
Nonaccrual Trouble Debt Restructuring Current 36,700,000   36,700,000   38,000,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR 900,000   900,000   700,000
Specific reserves related to troubled debt restructuring 600,000   600,000   200,000
Additional Specific Reserves Related To Troubled Debt Restructuring 10,000 950,000 290,000 975,000  
Modified substandard commercial loans, total recorded investment 111,000 33,000 111,000 33,000  
Modified substandard consumer loans, total recorded investment 5,000,000 4,400,000 5,000,000 4,400,000  
Loan Modifications on Nonacrrual status 175,000 1,900,000 $ 2,800,000 2,800,000  
Loan past due period before entering default status     30 days    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period 2,110,000 1,747,000 $ 2,326,000 1,775,000  
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     5,700,000   24,700,000
Financing Receivable With A Related Allowance Recorded [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Partial Charge-Offs On Impaired Loans     3,400,000   200,000
Commercial Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period 657,000 582,000 834,000 582,000  
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 290,000   290,000   $ 309,000
Accruing [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loans modified during period 13,000 58,000 13,000 58,000  
Nonaccrual [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loans modified during period $ 2,100,000 $ 1,700,000 $ 2,300,000 $ 1,700,000