Borrowing Arrangements - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Borrowings	$ 20,000	$ 133,442
Line of Credit \| Unsecured Credit Lines
Line of Credit Facility [Line Items]
Total credit limit	110,000	110,000
Borrowings	0	0
Line of Credit \| Federal Home Loan Bank Borrowings
Line of Credit Facility [Line Items]
Total credit limit	784,721	738,556
Borrowings	20,000	133,442
Letters of credit	27,000	27,000
Collateral pledged	1,408,418	1,236,732
Fair value of collateral	1,185,354	1,083,041
Line of Credit \| Federal Reserve Bank
Line of Credit Facility [Line Items]
Borrowings	0	0
Line of Credit \| Federal Reserve Bank \| Federal Reserve Bank Advances
Line of Credit Facility [Line Items]
Total credit limit	3,501	3,669
Collateral pledged	4,044	4,406
Fair value of collateral	$ 3,679	$ 3,828

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

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