Loans Loans - Restructured Loans Past Due in Excess of 90 Days on Financing Receivables (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Item	Sep. 30, 2017 USD ($) Item
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured During The Last Year In Excess of 90 Days Past Due | Item	0	1
Dollar amount of previously restructured loans past due	$ 0	$ 43,137
Restructured loans on non-accrual status at period end	0	58,898
Charge-offs of restructured loans recognized in connection with restructuring	0	0
Charge-offs of restructured loans recognized on previously restructured loans	4,650	9,951
Proceeds from the sale of restructured loans	15,750	0
Non Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans on non-accrual status at period end	$ 0	$ 54,082