Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Segment
Dec. 31, 2012
Segment
Dec. 31, 2011
Segment
Organization [Abstract]      
Common shares outstanding (in hundredths) 73.50%    
Nature of Operations [Abstract]      
Number of operating segments (in segments) 2 2 2
Cash and Cash Equivalents [Abstract]      
Federal funds and debt instruments maturity period (in months) 3 months    
Loans Held for Sale [Abstract]      
Mortgage loans selling period (in days) 45 days    
Carrying value of loans held for sale $ 2.3 $ 6.0  
Percentage of costs expensed on appropriate noninterest expense (in hundredths) 73.00%    
Income Taxes [Abstract]      
Realized income tax benefit (in hundredths) 50.00%    
Office properties [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives of office properties and equipment (in years) P10Y    
Office properties [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives of office properties and equipment (in years) P30Y    
Equipment [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives of office properties and equipment (in years) P3Y    
Equipment [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives of office properties and equipment (in years) P10Y    
Software [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives of office properties and equipment (in years) P3Y