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Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Bank premises and equipment
Premises and Equipment, Gross	$ 168,243us-gaap_PropertyPlantAndEquipmentGross	$ 151,374us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(54,508)	(49,849)
Premises and equipment, net	113,735us-gaap_PropertyPlantAndEquipmentNet	101,525us-gaap_PropertyPlantAndEquipmentNet
Premises
Bank premises and equipment
Premises and Equipment, Gross	121,434	109,570
Leasehold improvements
Bank premises and equipment
Premises and Equipment, Gross	6,296	6,185
Furniture and equipment
Bank premises and equipment
Premises and Equipment, Gross	28,955	26,315
Computer equipment
Bank premises and equipment
Premises and Equipment, Gross	11,342	9,033
Autos
Bank premises and equipment
Premises and Equipment, Gross	$ 216	$ 271