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Commercial Mortgage Banking - Components of Mortgage Servicing Rights Fees (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Transfers and Servicing [Abstract]        
Servicing fees $ 1,463 $ 1,402 $ 4,384 $ 4,121
Ancillary fees 47 86 241 259
Total MSR fees $ 1,510 $ 1,488 $ 4,625 $ 4,380