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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
Mar. 31, 2018
Dec. 31, 2017
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 273,500 $ 192,500
Assets Sold Under Agreements To Repurchase Interest Rate 1.96% 1.63%
Market value of underlying collateral of a repurchase agreement $ 293,068 $ 205,483
FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 293,068 205,483
Mturity less than 90 Days Member    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 83,500 $ 0
Assets Sold Under Agreements To Repurchase Interest Rate 1.52% 0.00%
Market value of underlying collateral of a repurchase agreement $ 90,170 $ 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 90,170  
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 $ 202,898 $ 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 $ 202,898 $ 205,483