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Borrowings - Narrative (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Percent of assets 30.00%  
Maximum borrowing capacity $ 1,960,000,000 $ 1,780,000,000
Percent outstanding advances 100.00%  
Pledged as collateral   13,200,000
Borrowings 467,071,000 421,352,000
Weighted average interest rate 1.14% 1.16%
Interest rate, range minimum 0.47%  
Interest rate, range maximum 3.51%  
Unused funds 1,490,000,000  
Percent of qualifying assets 95.00%  
Mortgage Loans on Real Estate
   
Debt Instrument [Line Items]    
Pledged as collateral 2,600,000,000 2,330,000,000
Securities Investment
   
Debt Instrument [Line Items]    
Asset balance used to determine maximum borrowing capacity from federal reserve bank 1,600,000  
Amount outstanding 0 0
Qualifying Loans
   
Debt Instrument [Line Items]    
Asset balance used to determine maximum borrowing capacity from federal reserve bank 599,000,000  
Putable
   
Debt Instrument [Line Items]    
Borrowings $ 37,100,000 $ 51,400,000