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Commercial Mortgage Banking - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Mortgage Banking [Abstract]              
Prepayment costs $ 5,300 $ 7,800 $ 6,500 $ 16,000      
Custodial escrow accounts 27,600   27,600   $ 421,500    
Uninsured balance relation to escrow accounts 15,700   15,700        
Fair value of servicing rights 6,200   6,200   41,800    
Carrying value of loan servicing rights $ 1,993   1,993   28,168 $ 29,220 $ 30,140
Servicing rights are amortized using straight-line method 10 years            
OMHHF              
Mortgage Banking [Abstract]              
Carrying value of loan servicing rights $ 1,993   $ 1,993   $ 28,168