Loans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable Disclosure [Abstract]
Residential real estate loan threshold for jumbo loans	$ 600,000
Threshold period past due for nonaccrual status of financing receivable	90 days
Threshold period past due for write-off of credit card loans	180 days
Threshold period special event notification for writeoff of financing receivable	60 days
Threshold period past due for writeoff of residential mortgage loans	180 days
Threshold period for writeoff of collateralized consumer loans	120 days
Risk rate loans, aggregate balance threshold	2,000,000.0
Risk rate loans, loan balance threshold	500,000
Average impaired balance	46,643,000	56,930,000	79,400,000
Interest income recognized while impaired	1,784,000	1,987,000	2,400,000
Troubled debt restructurings included in impaired loans	34,700,000	34,500,000
Current Troubled debt restructurings included in impaired loans	32,200,000	33,600,000
Troubled debt restructuring, aggregate exposure	2,000,000
Threshold for related party loans	$ 60,000