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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, 2016
Dec. 31, 2015
Receivables [Abstract]    
Recorded Investment $ 510,361 $ 269,628
Unpaid Principal Balance 503,632 265,831
Allowance $ 77,521 $ 43,480