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Borrowings and Related Interest (Repurchased Agreements Other Significant Data) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Repurchase Agreements [Abstract]      
Average Daily Aggregate Balance Outstanding $ 357,086 $ 393,133 $ 663,845
Maximum Outstanding Balance At Any Month End $ 457,053 $ 606,210 $ 902,500
Repurchase agreement weighted average interest rate during the year 2.17% 1.80% 2.83%
Weighted average interest rate at year end 2.49% 1.63% 2.47%