Short-Term Borrowings (Narrative) (Details)	12 Months Ended
Dec. 31, 2023 USD ($) Item	Dec. 31, 2024 USD ($)
Short-term Debt [Line Items]
Short-term borrowings	$ 1,154,829,000	$ 639,015,000
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 700,000,000	$ 0
FHLB Borrowings [Member] \| FHLB Borrowings, 5 Fixed Rate Notes [Member] \| Fixed-rate Term Notes [Member]
Short-term Debt [Line Items]
Number of fixed rate short-term borrowings \| Item	1
Short-term maturity year	2024

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant