Subsequent Events (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Jul. 29, 2014 Leverage Strategy [Member] Subsequent Event [Member] item	Jul. 29, 2014 Leverage Strategy Tier 1 [Member] Subsequent Event [Member]	Jul. 29, 2014 Leverage Strategy Tier 2 [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
FHLB line of credit available for leverage strategy, maximum		$ 2,100.0	$ 800.0	$ 1,300.0
Number of leverage strategy tiers to be utilized		2
Required investment in FHLB stock	4.50%
Estimated annual increase in pre-tax income resulting from leverage strategy		$ 4.5
FHLB borrowings threshold percentage of regulatory assets	40.00%