Loans and Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan item	Dec. 31, 2018 USD ($) loan item	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan costs	$ 3,000	$ 2,600
Mortgages serviced	302,300	304,900
Mortgage servicing rights	1,000	1,100
Allowance for impaired loans	908	1,020
Impaired loans	$ 4,665	6,128
Number of dealerships | item	2
Direct finance lease receivable	$ 4,700	4,900
Direct finance lease residual value	10,800	11,100
Average recorded investment	5,208	6,723	$ 9,300
Interest income recognized	247	437	482
Cash basis interest income recognized			$ 0
Troubled Debt Status [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for impaired loans	200	800
Accruing TDR Balance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructuring balance	1,000	1,800
Non-Accrual Status [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructuring balance	600	1,700
Financing receivable, net	$ 3,700	$ 4,300
Number of loans classified as TDRs | loan	2	4
Number of unrelated borrowers that had loans modified in a TDR | item	2	3