Business Segments - Segment Debt (Details)	6 Months Ended
Jun. 30, 2019 item
Mortgage Banking
Business Segments
Number of intersegment lines of credit	2
Mortgage Banking \| FHLB Advances \| Minimum
Business Segments
Variable rate, spread (as a percent)	0.50%
Mortgage Banking \| FHLB Advances \| Maximum
Business Segments
Variable rate, spread (as a percent)	1.75%
Consumer Finance \| Minimum
Business Segments
Variable rate, spread (as a percent)	2.00%
Consumer Finance \| Maximum
Business Segments
Variable rate, spread (as a percent)	8.00%
Consumer Finance \| LIBOR \| Minimum
Business Segments
Variable rate, spread (as a percent)	2.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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