FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Debt Disclosure [Abstract]
FHLB advances	$ 2,316,071	$ 2,316,071	$ 1,241,071
Other borrowings:
Notes payable	192,666	199,793	74,969
Short-term borrowings	10,124	17,612	15,872
Secured borrowings	320,007	317,942	328,889
Other	60,751	61,267	62,786
Total other borrowings	583,548	596,614	482,516
Subordinated notes	437,493	437,392	437,033
Total FHLB advances, other borrowings and subordinated notes	$ 3,337,112	$ 3,350,077	$ 2,160,620