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Commercial Mortgage Banking - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Servicing Liability at Amortized Cost [Line Items]      
Company owned OMHHF 83.68%    
Prepayment costs $ 14,500,000 $ 7,400,000 $ 0
Custodial escrow accounts 251,400,000 242,700,000  
Uninsured balance relation to escrow accounts 139,100,000    
Carrying value of loan servicing rights 28,879,000 26,983,000 22,795,000
Servicing rights are amortized using straight-line method 10 years    
Mortgage Servicing Rights [Member]
      
Servicing Liability at Amortized Cost [Line Items]      
Fair value of servicing rights 40,100,000 33,000,000  
Carrying value of loan servicing rights $ 28,900,000 $ 27,000,000  
Weighted average remaining life 6 years 4 months 24 days    
OMHHF [Member]
      
Servicing Liability at Amortized Cost [Line Items]      
Company owned OMHHF 83.68%    
Non-controlling interest 16.32%    
Number of related party 1