Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Modified Loans	$ 112,206	$ 61,006
Charge-offs	10,523	4,968
Payment- Default	$ 25,526	$ 25,671