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Short-Term Borrowings (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Item | Dec. 31, 2021 USD ($) Item
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,871,271 | $ 1,665,061
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,425,000 | $ 1,100,000
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 | 5
Short-term maturity year | 2023 |
FHLB Borrowings [Member] | FHLB Borrowings, 5 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] | Minimum [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year |  | 2034
FHLB Borrowings [Member] | FHLB Borrowings, 5 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] | Maximum [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year |  | 2035

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