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Derivative Financial Instruments and Hedging Activities - Schedule of Other Income (Expense), Net Related to Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Gain (loss) on economic hedges $ 10 $ (1,387) $ (1,377)
Write-off of losses in AOCL for a discontinued hedge relationship [1] (201) (337) (7,042)
Gain (loss) on derivatives, net $ (191) $ (1,724) $ (8,419)
[1] Includes the accelerated write-off in 2015 of deferred losses on a swap that had been designated for accounting purposes as a hedge of the purchase price of an MSR acquisition, when we sold a portion of the related MSRs.