Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Building and building improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	25 years
Building and building improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	40 years
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	10 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	20 years
Furniture and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	5 years
Furniture and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	15 years
Computer Equipment And Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	2 years
Computer Equipment And Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	5 years
Automobiles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful life	4 years