Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 214,027	$ 221,401
Less accumulated depreciation and amortization	(63,685)	(57,162)
Total	150,342	164,239
Depreciation and amortization expense	11,800	12,300	$ 10,900
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	47,438	51,446
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	101,196	102,808
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	19,491	20,604
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	26,709	28,662
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	536	587
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 18,657	$ 17,294