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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
Jun. 30, 2018
Dec. 31, 2017
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 387,379 $ 192,500
Assets Sold Under Agreements To Repurchase Interest Rate 2.20% 1.63%
Market value of underlying collateral of a repurchase agreement $ 412,677 $ 205,483
FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 412,677 205,483
Mturity less than 90 Days Member    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 197,379 $ 0
Assets Sold Under Agreements To Repurchase Interest Rate 2.24% 0.00%
Market value of underlying collateral of a repurchase agreement $ 210,095 $ 0
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   0
Market value of underlying collateral of a repurchase agreement 210,095  
Maturity over 90 days    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 190,000 $ 192,500
Assets Sold Under Agreements To Repurchase Interest Rate 2.15% 1.63%
Market value of underlying collateral of a repurchase agreement $ 202,582 $ 205,483
Maturity over 90 days | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement $ 202,582 $ 205,483