Commercial Mortgage Banking - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Mortgage Banking [Abstract]
Percentage of controlling interest owned by the company in OMHHF	83.68%
Non-controlling interest	16.32%		16.32%
Number of related party	1
Prepayment costs	$ 7,800	$ 1,500	$ 16,000	$ 1,800
Custodial escrow accounts	347,700		347,700		$ 285,500
Uninsured balance relation to escrow accounts	227,100		227,100
Fair value of servicing rights	41,400		41,400		42,300
Carrying value of loan servicing rights	$ 29,220	$ 29,115	$ 29,220	$ 29,115	$ 30,140	$ 28,879
Servicing rights are amortized using straight-line method	10 years