Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Modified Loans	$ 134,489	$ 92,782	$ 246,695	$ 153,848
Charge-offs	12,215	5,464	22,738	10,432
Payment- Default	$ 23,679	$ 21,388	$ 49,113	$ 47,089