Loans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 2,500,000.0
Risk rate loans, loan balance threshold	500,000
Average impaired balance	39,230,000	$ 37,972,000	$ 35,600,000
Interest income recognized while impaired	1,763,000	1,680,000	$ 2,200,000
Troubled debt restructurings included in impaired loans	25,700,000	27,000,000
Current Troubled debt restructurings included in impaired loans	$ 22,900,000	26,600,000
Threshold Period Past Due for Loans to be Default	30 days
Non Homogenous Commercial Loan Relationship, Annual Loan Review, Threshold	$ 2,500,000
Concentrations of Loans to any Single Industry in Excess of Ten Percent of Total Loans	0	$ 0
Threshold for related party loans	$ 60,000