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Cash and Due from Banks (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash and Cash Equivalents [Abstract]
Average balance maintained	$ 911.2	$ 1,900.0

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- Definition

Average amount of collected cash balances with commercial banks the Federal Home Loan Banks (FHLBanks) maintain in return for certain services.

+ References

No definition available.

+ Details

Name:	us-gaap_AverageCollectedCashBalancesWithCommercialBanksFederalHomeLoanBank
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration