Quarterly report pursuant to Section 13 or 15(d)

Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details)

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Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 4,116,861 $ 2,762,920
Available-for-sale Securities [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 2,867,105 2,284,532
Loans Held-for-sale, Mortgages [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 693,298 397,656
Retained Interest [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 556,458 $ 80,732