Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	$ 226,699	$ 206,322
Accumulated depreciation	(120,382)	(108,826)
Total Premises and Equipment, Net	106,317	97,496
Land [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	28,447	27,402
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	120,370	110,380
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	$ 77,882	$ 68,540