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Allowance for Loan Losses - Recorded Investment, Unpaid Principal Balance and Related Allowance for TDR Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Recorded Investment $ 234,360 $ 60,278
Unpaid Principal Balance 231,286 59,402
Allowance $ 43,001 $ 9,815