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Borrowings and Related Interest (Repurchased Agreements Other Significant Data) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Repurchase Agreements [Abstract]
Average Daily Aggregate Balance Outstanding	$ 299,842	$ 357,086	$ 393,133
Maximum Outstanding Balance At Any Month End	$ 461,954	$ 457,053	$ 606,210
Weighted average interest rate during the year	2.48%	2.17%	1.80%
Weighted average interest rate at year end	2.45%	2.49%	1.63%

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- Definition

Average daily aggregate balance outstanding of repurchase agreements and other debts instruments

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- Definition

Maximum outstanding balance at any month-end of repurcase agreements and other debt instruments.

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- Definition

Repurchase agreement weighted average interest rate at year end

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- Definition

Weighted average interest rate during the year

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