Loans (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 11,000,000		$ 11,000,000		$ 10,400,000
Troubled Debt Restructuring, Classification removed	335,000		2,000,000
Partial Charge-Offs On Impaired Loans			22,201,000		28,705,000
Impaired Financing Receivable, Related Allowance	4,232,000		4,232,000		4,191,000
Recorded investment, related to loans	16,000,000		16,000,000		19,900,000
Troubled Debt Restructuring Included In Nonaccrual Loans	51,200,000		51,200,000		41,100,000
TDRs included in accruing loan totals	17,400,000		17,400,000		25,100,000
Nonaccrual Trouble Debt Restructuring Current	42,700,000		42,700,000		19,100,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	1,200,000		1,200,000		2,300,000
Specific reserves related to troubled debt restructuring	1,900,000		1,900,000		2,300,000
Additional Specific Reserves Related To Troubled Debt Restructuring	0	$ 212,000	975,000	$ 1,200,000
Modified substandard commercial loans, total recorded investment	437,000	245,000	437,000	245,000
Modified substandard consumer loans, total recorded investment	5,100,000	12,800,000	5,100,000	12,800,000
Loan Modifications on Nonacrrual status	7,600,000	160,000	$ 8,500,000	1,000,000
Loan past due period before entering default status			30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	3,869,000	2,664,000	$ 3,951,000	2,710,000
Deposit Liabilities Reclassified as Loans Receivable	2,800,000		2,800,000		1,700,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans			16,700,000		24,200,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans			5,500,000		4,500,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	808,000		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	525,000		525,000		$ 381,000
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	14,000	61,000	14,000	61,000
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	$ 3,900,000	$ 2,600,000	$ 3,900,000	$ 2,600,000