Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Modified Loans	$ 398,324	$ 244,890	$ 59,402
Charge-offs	24,628	10,877	948
Payment-Default	$ 64,811	$ 51,602	$ 325