Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Schedule of Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Federal funds purchased and securities sold under agreements to repurchase	$ 1,037,075	$ 1,272,591