Commitments and Contingent Liabilities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination	$ 4,396,000	$ 6,457,000
Mortagage loans held for sale	4,063,000	5,991,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	$ 4,063,000	$ 5,991,000
Minimum [Member]
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination, funding period	60 days
Maximum [Member]
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination, funding period	90 days