FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Disclosure [Abstract]
FHLB advances	$ 2,316,071	$ 1,241,071	$ 1,241,071
Other borrowings:
Notes payable	64,268	80,319	85,668
Short-term borrowings	9,212	9,198	14,051
Secured borrowings	311,958	341,327	341,038
Other	61,777	63,292	63,770
Total other borrowings	447,215	494,136	504,527
Subordinated notes	437,260	436,938	436,811
Total FHLB advances, other borrowings and subordinated notes	$ 3,200,546	$ 2,172,145	$ 2,182,409