Loans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Threshold Period Past Due for Loans to be Default	30 days
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	$ 2,500,000.0
Risk rate loans, loan balance threshold	500,000
Average impaired balance	37,895,000	$ 44,060,000	$ 46,600,000
Interest income recognized while impaired	1,324,000	1,524,000	$ 1,800,000
Troubled debt restructurings included in impaired loans	28,600,000	30,500,000
Current Troubled debt restructurings included in impaired loans	28,100,000	$ 28,900,000
Troubled debt restructuring, aggregate exposure	2,500,000.0
Threshold for related party loans	$ 60,000