Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	$ 175,569	$ 168,665
Accumulated depreciation	(100,261)	(93,207)
Total Premises and Equipment, Net	75,308	75,458
Land [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	21,749	21,588
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	91,920	88,577
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Premises and Equipment, Gross	$ 61,900	$ 58,500