Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 139,216	$ 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	87,525	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	$ 51,691	$ 51,212