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Mortgage Servicing - Schedule of MSRs (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Transfers and Servicing [Abstract]    
MSRs - Amortization method $ 1,953,352 $ 678,937
MSRs - Fair value measurement method 116,029 85,213
Mortgage servicing rights, total $ 2,069,381 $ 764,150