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, 2016
Dec. 31, 2015
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 4,390,750 $ 4,264,416
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 3,156,325 2,412,970
Loans Held-for-sale, Residential Mortgages [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 632,698 735,911
Commercial Real Estate Assets [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 597,603 252,172
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 $ 4,124 $ 863,363