Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Premises and Equipment
Depreciation expense	$ 14,365,000	$ 12,108,000	$ 10,485,000
Total rent expense	3,137,000	2,786,000	2,912,000
Related party rent expense	$ 150,000	$ 146,000	$ 142,000