FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Debt Disclosure [Abstract]
FHLB advances	$ 2,026,071	$ 2,316,071	$ 1,166,071
Other borrowings:
Notes payable	185,539	199,793	69,619
Short-term borrowings	17,773	17,612	16,418
Secured borrowings	326,348	317,942	334,467
Other	135,559	61,267	62,283
Total other borrowings	665,219	596,614	482,787
Subordinated notes	437,628	437,392	437,162
Total FHLB advances, other borrowings and subordinated notes	$ 3,128,918	$ 3,350,077	$ 2,086,020