Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Modified Loans	$ 394,639	$ 498,812	$ 398,324
Charge-offs	52,823	48,469	24,628
Payment-Default	$ 90,231	$ 92,532	$ 64,811