Loan Sales and Servicing - Sales in the Secondary Market (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gains recognized on sales of residential real estate loans originated for sale in the secondary market		$ 3,529	$ 4,621
Originated For Sale In The Secondary Market
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loans originated for sale in the secondary market sold	[1]	132,470	172,206
Net gains recognized on sales of residential real estate loans originated for sale in the secondary market	[2]	$ 3,529	$ 4,621

[1] Includes loans originated for sale where the Company retained servicing responsibilities.

[2] Net gains were recorded in mortgage banking income in the Company's Unaudited Condensed Consolidated Statements of Income.