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Borrowings - Narrative (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Percent of assets 25.00%  
Maximum borrowing capacity $ 2,510,000,000 $ 2,360,000,000
Percent outstanding advances 100.00%  
Borrowings $ 610,398,000 530,591,000
Unused funds $ 1,900,000,000  
Percent of qualifying assets 95.00%  
Mortgage Loans on Real Estate    
Debt Instrument [Line Items]    
Pledged as collateral $ 3,330,000,000 3,130,000,000
Securities Investment    
Debt Instrument [Line Items]    
Asset balance used to determine maximum borrowing capacity from federal reserve bank 900,000  
Amount outstanding 0  
Qualifying Loans    
Debt Instrument [Line Items]    
Asset balance used to determine maximum borrowing capacity from federal reserve bank 735,400,000  
Putable    
Debt Instrument [Line Items]    
Borrowings $ 20,400,000 $ 20,600,000
Weighted Average    
Debt Instrument [Line Items]    
FHLB advances, interest rate 1.28% 1.15%
Minimum    
Debt Instrument [Line Items]    
FHLB advances, interest rate 0.41%  
Maximum    
Debt Instrument [Line Items]    
FHLB advances, interest rate 3.67%