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Investment Securities - Transfer from AFS to HTM (Details)
$ in Millions
Oct. 30, 2015
USD ($)
Schedule of Available for Sale and Held-to-Maturity Securities  
Remaining expected lives of available-for-sale securities transferred to held-to-maturity 4 years
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations  
Schedule of Available for Sale and Held-to-Maturity Securities  
Available-for-sale securities transferred into held-to-maturity, amortized cost $ 100.3
Available-for-sale securities transferred into held-to-maturity, Fair value 100.1
Available-for-sale securities transferred into held-to-maturity, unrealized net losses $ 0.2