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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Carrying amounts of the assets pledged as collateral
Securities for reverse repurchase agreements	$ 0	$ 0
In-substance debt defeasance	0	0
Asset Pledged as Collateral
Carrying amounts of the assets pledged as collateral
Assets pledged as collateral	10,820,499	10,294,047
Public deposits | Asset Pledged as Collateral with Right
Carrying amounts of the assets pledged as collateral
Assets pledged as collateral	1,955,888	1,729,131
Federal Home Loan Bank | Asset Pledged as Collateral
Carrying amounts of the assets pledged as collateral
Assets pledged as collateral	4,860,950	4,959,298
Federal Reserve Bank | Asset Pledged as Collateral
Carrying amounts of the assets pledged as collateral
Assets pledged as collateral	$ 4,003,661	3,605,233
Interest rate derivatives | Asset Pledged as Collateral without Right
Carrying amounts of the assets pledged as collateral
Assets pledged as collateral		$ 385

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- Definition

Amount of debt extinguished by in-substance defeasance.

+ References

No definition available.

+ Details

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- References

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X

- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

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- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

No definition available.

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- Details

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