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Borrowings (Other Significant Details) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfRepurchaseAgreementsAbstract    
Average Daily Aggregate Balance Outstanding $ 663,845 $ 1,012,756
Maximum Outstanding Balance At Any Month End $ 902,500 $ 1,158,945
Repurchase agreement weighted average interest rate during the year 2.83% 2.92%
Weighted average interest rate at year end 2.47% 3.10%