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Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Receivables [Abstract]    
Modified Loans $ 84,174 $ 112,206
Charge-offs 15,460 10,523
Payment Default $ 29,757 $ 25,526