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Restrictions on Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2021
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Cash Equivalents	Restrictions on Cash and Cash Equivalents The Bank is required to maintain reserves against its deposit liabilities. Prior to March 2020, reserves were in the form of cash and balances with the FRB. The FRB suspended cash reserve requirements effective March 26, 2020. In addition, cash collateral is posted by the Corporation with counterparties to secure derivatives and other contracts. The amounts of such cash collateral as of September 30, 2021 and December 31, 2020 were $238.7 million and $408.1 million, respectively.

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- Definition

Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
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-Topic 230
-SubTopic 10
-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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