Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premises and Equipment
Depreciation expense	$ 15,294,000	$ 14,365,000	$ 12,108,000
Total rent expense	3,255,000	3,137,000	2,786,000
Related party rent expense	$ 153,000	$ 150,000	$ 146,000