Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 88,711,000	$ 62,412,000
Less accumulated depreciation	23,773,000	28,064,000
Premises and equipment, net	64,938,000	34,348,000
Depreciation	3,500,000	2,300,000	2,100,000
Land
Property, Plant and Equipment [Line Items]
Total premises and equipment	22,364,000	10,876,000
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Total premises and equipment	52,067,000	33,482,000
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 14,280,000	$ 18,054,000