Loans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Troubled Debt Restructuring, Classification removed	$ 2,872,000
Partial Charge-Offs On Impaired Loans			96,800,000		105,100,000
Allowance for loan losses individually evaluated for impairment	7,466,000		7,466,000		8,276,000
Recorded investment, related to loans	24,200,000		24,200,000		28,800,000
TDRs included in nonaccrual loan totals	81,900,000		81,900,000		84,700,000
TDRs included in accruing loan totals	22,500,000		22,500,000		29,900,000
Nonaccrual TDRs considered current	59,000,000		59,000,000		52,600,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	5,100,000		5,100,000		5,000,000
Specific reserves related to troubled debt restructuring	5,000,000		5,000,000		5,600,000
Additional specific reserves related to troubled debt restructurings	33,000	818,000	300,000	1,100,000
Modified substandard commercial loans, total recorded investment	1,000,000	1,200,000	1,000,000	1,200,000
Modified substandard consumer loans, total recorded investment	12,000,000	16,000,000	12,000,000	16,000,000
Loan Modifications on Nonacrrual status	3,000,000	2,200,000	3,300,000	8,000,000
Loan past due period before entering default status			30 days
Loans modified during period	6,500,000	14,900,000	7,600,000	17,000,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans			89,100,000		96,900,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans			7,700,000		8,200,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Allowance for loan losses individually evaluated for impairment	703,000		703,000		1,540,000
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	421,000	110,000	1,100,000	110,000
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans modified during period	$ 6,100,000	$ 14,800,000	$ 6,500,000	$ 16,900,000