Short-Term Borrowings and Long-Term Debt Long Term (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term borrowings	$ 621,345	$ 1,296,263
Other long-term debt	939	507
FHLB advances
Debt Instrument [Line Items]
Long-term borrowings	0	535,973
Unused borrowing capacity	5,800,000
Subordinated debt
Debt Instrument [Line Items]
Long-term borrowings	543,778	625,000
Senior notes
Debt Instrument [Line Items]
Long-term borrowings	65,000	125,000
Junior subordinated deferrable interest debentures
Debt Instrument [Line Items]
Long-term borrowings	16,496	16,496
Unamortized discounts and issuance costs
Debt Instrument [Line Items]
Long-term borrowings	$ 4,868	$ 6,713