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Restrictions on Cash and Due from Banks (Details) (Subsidiaries, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Subsidiaries
   
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash reserves due from subsidiary $ 97.0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 93.1us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember