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Allowance for Loan Losses - Recorded Investment, Unpaid Principal Balance and Related Allowance for TDR Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Recorded Investment $ 712,019 $ 620,991
Unpaid Principal Balance 701,860 612,606
Allowance $ 87,150 $ 86,930