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Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Gross $ 618,504 $ 791,119
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 0 0
Remaining contractual maturity of the agreements overnight and continuous 610,127 782,589
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 8,377 8,530
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total 618,504 791,119
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement 618,504 791,119
US Treasury Securities [Member]    
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Remaining contractual maturity of the agreements overnight and continuous 523,128 427,402
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 0 0
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total 523,128 427,402
Residential mortgage-backed securities [Member]    
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Remaining contractual maturity of the agreements overnight and continuous 86,999 355,187
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 8,377 8,530
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total $ 95,376 $ 363,717