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Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Financing Receivable, Recorded Investment, Aging [Abstract]  
Current $ 21,256,771
30 to 59 Days Past Due 427,155
60 to 89 Days Past Due 84,481
90 Days or More Past Due 58,366
Total 21,826,773
FHLMC [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Current 7,804,568
30 to 59 Days Past Due 84,339
60 to 89 Days Past Due 14,825
90 Days or More Past Due 22,326
Total 7,926,058
FNMA [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Current 6,495,003
30 to 59 Days Past Due 91,699
60 to 89 Days Past Due 14,698
90 Days or More Past Due 17,281
Total 6,618,681
GNMA [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Current 6,569,093
30 to 59 Days Past Due 245,827
60 to 89 Days Past Due 54,429
90 Days or More Past Due 16,867
Total 6,886,216
Other [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Current 388,107
30 to 59 Days Past Due 5,290
60 to 89 Days Past Due 529
90 Days or More Past Due 1,892
Total $ 395,818