Investments (Unconsolidated Subsidiaries) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	$ 306,859	$ 358,820
Qualified affordable housing project tax credit partnerships
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	37,061	46,421
Other tax credit partnerships
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	0	2,085
All other investments, primarily investment fund LPs/LLCs
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	$ 269,798	$ 310,314