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Investment Securities - Pledged Securities and Concentration Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Collateral Dependent Loans
Financial Instruments Owned and Pledged as Collateral
Investment securities pledged as collateral	$ 3,800,000	$ 5,000,000
Collateral Dependent Loans | Borrowing Capacity
Financial Instruments Owned and Pledged as Collateral
Investment securities pledged as collateral	2,100,000	2,300,000
Collateral Dependent Loans | Public deposits
Financial Instruments Owned and Pledged as Collateral
Investment securities pledged as collateral	1,700,000	2,600,000
Collateral Dependent Loans | Other financial transactions
Financial Instruments Owned and Pledged as Collateral
Investment securities pledged as collateral	19,300	183,000
Non-government issuer
Concentration of risk
Securities of issuers in excess of 10% of stockholders' equity	$ 0	$ 0

X

- Definition

Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

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- References

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- Definition

Fair value of investment subject to concentration of credit or market risk or both.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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