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Borrowings (Repurchase Transaction Liability and Market Value of its Underlying Collateral) (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 652,229 $ 932,500
Assets Sold Under Agreements To Repurchase Interest Rate 2.47% 3.10%
Market value of underlying collateral of a repurchase agreement $ 700,498 $ 1,021,370
FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 575,915 1,006,659
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 75,629 2,131
US Treasury Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 48,954 12,580
Mturity less than 90 Days Member    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 349,729 $ 30,000
Assets Sold Under Agreements To Repurchase Interest Rate 3.35% 0.70%
Market value of underlying collateral of a repurchase agreement $ 372,778 $ 31,961
Mturity less than 90 Days Member | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 248,288 31,961
Mturity less than 90 Days Member | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 75,536 0
Mturity less than 90 Days Member | US Treasury Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 48,954 0
Maturity over 90 days    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 302,500 $ 902,500
Assets Sold Under Agreements To Repurchase Interest Rate 1.44% 3.18%
Market value of underlying collateral of a repurchase agreement $ 327,720 $ 989,409
Maturity over 90 days | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 327,627 974,698
Maturity over 90 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 93 2,131
Maturity over 90 days | US Treasury Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 0 $ 12,580