Commitments and Contingent Liabilities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Rent expense, operating leases	$ 2,200,000	$ 878,000	$ 807,000
Notional Amount	9,886,000
Reserve amount, mortgage loans on real-estate	953,000	1,029,000	$ 1,029,000
Forward Contracts [Member]
Other Commitments [Line Items]
Notional Amount	39,300,000	54,300,000
Open forward contracts, fair value	(56,000)	(102,000)
Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Interest rate lock commitments	20,000,000	37,900,000
Best efforts commitments	3,200,000	7,300,000
Hedged interest rate lock commitments	16,800,000	30,600,000
Fair value of hedged interest rate lock commitments	297,000	484,000
Interest Rate Lock Commitments [Member] | Best Efforts Basis [Member]
Other Commitments [Line Items]
Fair value of best efforts commitments	$ 23,000	$ 82,000