Premises and Equipment, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Premises and Equipment, Net [Abstract]
Depreciation and Amortization	$ 7,600,000	$ 8,200,000	$ 8,100,000
Operating Leases, Rent Expense, Gross	31,700,000	30,000,000	26,200,000
Operating Leases, Income Statement, Lease Revenue	481,000	$ 500,000	$ 487,000
Future Minimum Sublease Rental Income	$ 21,100,000