Certain Transfers of Financial Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Residential Mortgage Servicing Rights [Roll Forward]    
Ending carrying value, net $ 64,897 $ 53,202
Residential mortgage    
Residential Mortgage Servicing Rights [Roll Forward]    
Beginning carrying value, net 46,785 23,085
Additions 20,593 27,823
Amortization (7,335) (6,064)
Recovery (impairment), net (3,323) 1,941
Ending carrying value, net 56,720 46,785
Residential Mortgage Servicing Rights Impairment [Roll Forward]    
Beginning balance 3,129 5,070
Additions 4,898 2,719
Recoveries (1,575) (4,660)
Ending balance $ 6,452 $ 3,129