Loans (Narrative) (Details)		3 Months Ended
	Apr. 30, 2020 USD ($) contract	Mar. 31, 2020 USD ($)	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
Loan review aggregate exposure amount on non-homogenous commercial loan relationships		5,000,000.0
Troubled debt restructurings included in impaired loans		25,800,000	$ 25,700,000
Current Troubled debt restructurings included in impaired loans		22,400,000	$ 22,900,000
Commitments to Lend Funds for Restructured Loans		0
Financing Receivable, Troubled Debt Restructuring, Individually Evaluated for Impairment, Minimum		$ 500,000
Number of days past due to be considered in default		30 days
Document Period End Date		Mar. 31, 2020
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family rental small loan / large loan classification		$ 600,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family rental small loan / large loan classification		$ 600,000
Subsequent Event [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications in Connection with the COVID-19 Relief Provided by the CARES Act | contract	550
Outstanding Loan Balance of Modifications in Connection with the COVID-19 Relief Provided by the CARES Act	$ 338,000,000
Duration of Modifications in Connection with COVID-19 Relief Provided by the CARES Act	6 months