Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Receivables [Abstract]
Modified Loans	$ 168,645	$ 116,419	$ 415,341	$ 270,266
Charge-offs	12,227	5,925	34,965	16,357
Payment- Default	$ 28,275	$ 23,326	$ 77,248	$ 70,401