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Securities Sold Under Repurchase Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities sold under repurchase agreements by collateral pledged    
Total securities sold under repurchase agreements $ 122,930 $ 127,007
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Securities sold under repurchase agreements by collateral pledged    
Total securities sold under repurchase agreements 71,075 75,795
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Securities sold under repurchase agreements by collateral pledged    
Total securities sold under repurchase agreements $ 51,855 $ 51,212