Loans (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 contract	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due when loans are placed on nonaccrual status			90 days
Number of days past due for credit card loan charge offs			180 days
Number of days for credit card charge offs after specified event			60 days
Number of days past due for residential mortgage loan charge offs to net realizable value			180 days
Number of days past due for consumer loan charge offs to net realizable value			120 days
TDR loans considered material	$ 500,000		$ 500,000
Loan review aggregate exposure amount on non-homogenous commercial loan relationships	5,000,000.0		5,000,000.0
Troubled debt restructurings included in impaired loans	25,200,000		25,200,000		$ 25,700,000
Current Troubled debt restructurings included in impaired loans	21,300,000		21,300,000		$ 22,900,000
Commitments to Lend Funds for Restructured Loans	0		0
Financing Receivable, Troubled Debt Restructuring, Individually Evaluated for Impairment, Minimum	500,000		$ 500,000
Number of days past due to be considered in default			30 days
Outstanding Loan Balance of Modifications in Connection with the COVID-19 Relief Provided by the CARES Act	$ 117,700,000		$ 117,700,000
Document Period End Date			Sep. 30, 2020
Financing Receivable, Modifications, Number of Contracts | contract	2	0	3	13
Loans Collectively Evaluated Fully Guaranteed or Cash Secured Loans	$ 106,400,000		$ 106,400,000
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family rental small loan / large loan classification	600,000		600,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family rental small loan / large loan classification	$ 600,000		$ 600,000