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Deposits - Summary (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 9,101,491 $ 8,946,514
Deposits - non-interest bearing 71,531 55,036
Deposits $ 9,173,022 $ 9,001,550