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Securities Sold Under Agreements to Repurchase - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets Sold Under Agreements To Repurchase [Line Items]    
Securities sold under agreement to repurchase, carrying value $ 21,561 $ 105,133
Mortgage Backed Securities    
Assets Sold Under Agreements To Repurchase [Line Items]    
Securities sold under agreement to repurchase, carrying value $ 21,561 $ 105,133