Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	$ 14,556		$ 42,234
Non-interest income within the scope of other GAAP topics	1,197		3,622
Noninterest Income	15,753	$ 14,611	45,856	$ 48,043
Fees and Commissions, Depositor Accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	7,598		21,783
Fees and Commissions, Debit Cards [Member]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	4,677		13,543
Fees and Commissions, Fiduciary and Trust Accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	1,579		4,792
Other Non-Interest Income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	$ 702		$ 2,116