Loans (Narrative) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Loans Considered Current	98.50%	98.60%
Mortgage Loans in Process of Foreclosure, Amount	$ 2,100,000
Loans and leases receivable, impaired, commitment to lend	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged assets separately reported, loans pledged as collateral, at fair value	440,349,000,000	$ 172,693,000
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged assets separately reported, loans pledged as collateral, at fair value	$ 484,772,000,000	$ 458,227,000