Loans (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 11,700,000		$ 11,100,000
Troubled Debt Restructuring, Classification removed	0	$ 806,000
Partial Charge-Offs On Impaired Loans	23,731,000		24,943,000
Impaired Financing Receivable, Related Allowance	1,091,000		548,000
Recorded investment, related to loans	3,300,000		2,100,000
Troubled Debt Restructuring Included In Nonaccrual Loans	47,800,000		46,900,000
TDRs included in accruing loan totals	21,200,000		18,200,000
Nonaccrual Trouble Debt Restructuring Current	40,200,000		38,000,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	1,100,000		700,000
Specific reserves related to troubled debt restructuring	500,000		200,000
Additional Specific Reserves Related To Troubled Debt Restructuring	280,000	25,000
Modified substandard commercial loans, total recorded investment	113,000	0
Modified substandard consumer loans, total recorded investment	1,400,000	2,000,000
Loan Modifications on Nonacrrual status	$ 2,600,000	922,000
Loan past due period before entering default status	30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	$ 1,987,000	1,095,000
Deposit Liabilities Reclassified as Loans Receivable	2,000,000		2,900,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	17,400,000		24,700,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	6,300,000		200,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	838,000
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
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance	179,000		$ 309,000
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	60,000	37,000
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	$ 1,900,000	$ 1,100,000