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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
 6 Months Ended 12 Months Ended
Jun. 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 $ 580,714 $ 791,119
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 0 0
Remaining contractual maturity of the agreements overnight and continuous 568,356 782,589
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 12,358 8,530
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total 580,714 791,119
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement 580,714 791,119
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 434,576 427,402
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 434,576 427,402
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 133,780 355,187
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 12,358 8,530
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total $ 146,138 $ 363,717