FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Debt Disclosure [Abstract]
FHLB advances	$ 1,166,071	$ 1,241,071	$ 1,241,071
Other borrowings:
Notes payable	69,619	80,319	91,016
Short-term borrowings	16,418	9,198	15,597
Secured borrowings	334,467	341,327	347,663
Other	62,283	63,292	64,217
Total other borrowings	482,787	494,136	518,493
Subordinated notes	437,162	436,938	436,719
Total FHLB advances, other borrowings and subordinated notes	$ 2,086,020	$ 2,172,145	$ 2,196,283