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Borrowings (Other Significant Details) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
DisclosureOfRepurchaseAgreementsAbstract    
Average Daily Aggregate Balance Outstanding $ 1,012,756 $ 1,041,378
Maximum Outstanding Balance At Any Month End $ 1,158,945 $ 1,149,167
Repurchase agreement weighted average interest rate during the year 2.92% 2.85%
Weighted average interest rate at year end 3.10% 2.95%