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Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Receivables [Abstract]    
Modified Loans $ 61,006 $ 122,120
Charge-offs 4,968 930
Payment-Default $ 25,671 $ 4,785