Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	$ 13,465
Non-interest income within the scope of other GAAP topics	1,027
Noninterest Income	14,492	$ 18,507
Fees and Commissions, Depositor Accounts [Domain]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	6,862
Fees and Commissions, Debit Cards [Domain]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	4,334
Fees and Commissions, Fiduciary and Trust Accounts [Domain]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	1,568
Other Non-Interest Income [Domain]
Disaggregation of Revenue [Line Items]
Non-interest income from contracts with customers	$ 701