Acquisitions - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2015	Jun. 30, 2015	Jun. 30, 2015
J.P. Morgan Retirement Plan Services (RPS)
Business Acquisition [Line Items]
Revenue of acquired entity from date of acquisition		$ 46,318	$ 94,946
Net income of acquired entity from date of acquisition		$ 298	$ 1,298
Putnam Retirement Business
Business Acquisition [Line Items]
Cash paid	$ 4,114
Other assets acquired	11,501
Other liabilities assumed	7,895
Dividend	$ 508