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Short-Term Borrowings (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Short-term Debt [Line Items]
Short-term borrowings	$ 1,667,513	$ 2,714,872
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 1,100,000	$ 2,035,000
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	5
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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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