Borrowings (Narrative) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Debt Disclosure [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	$ 1,400.0
Total outstanding advances	$ 103.8
Debt, Weighted Average Interest Rate	3.50%
FHLB issued letters of credit	$ 291.5