Loans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 10,300		$ 10,400
Troubled Debt Restructuring, Classification removed	806
Partial Charge-Offs On Impaired Loans	28,422		28,705
Impaired Financing Receivable, Related Allowance	4,930		4,191
Recorded investment, related to loans	13,500		19,900
Troubled Debt Restructuring Included In Nonaccrual Loans	49,400		41,100
TDRs included in accruing loan totals	15,100		25,100
Nonaccrual Trouble Debt Restructuring Current	35,900		19,100
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	2,700		2,300
Specific reserves related to troubled debt restructuring	2,600		2,300
Additional Specific Reserves Related To Troubled Debt Restructuring	25	$ 857
Modified substandard commercial loans, total recorded investment	0	131
Modified substandard consumer loans, total recorded investment	2,000	4,500
Loan Modifications on Nonacrrual status	$ 922	1,100
Loan past due period before entering default status	30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	$ 1,095	$ 1,116
Deposit Liabilities Reclassified as Loans Receivable	1,900		1,700
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	24,000		24,200
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	4,400		4,500
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	593		$ 381
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	37
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	$ 1,100