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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,667,513	$ 2,714,872
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	300	195,450
Average amount outstanding during period	9,708	49,297
Maximum amount at any month end during period	$ 330,330	$ 202,933
Weighted-average interest at period end	0.15%	1.60%
Weighted-average interest rate during period	1.15%	2.30%
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 567,213	$ 484,422
Average amount outstanding during period	600,167	493,344
Maximum amount at any month end during period	$ 806,645	$ 518,042
Weighted-average interest at period end	0.14%	0.54%
Weighted-average interest rate during period	0.24%	0.52%
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,100,000	$ 2,035,000
Average amount outstanding during period	1,368,320	1,399,503
Maximum amount at any month end during period	$ 2,110,000	$ 1,941,774
Weighted-average interest at period end	0.49%	1.17%
Weighted-average interest rate during period	0.62%	1.96%

X

- Definition

The average effective interest rate during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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