Loans and Allowance for Credit Losses (Effect on Loan Loss Provision as a Result of Changes in Methodology) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 700	$ 1,674
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	767	363
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	749	694
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	85	(54)
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	200	115
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ (1,101)	$ 556