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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Federal reserve and federal home loan bank stock	$ 28,306	$ 51,763
Accrued interest, after allowance for credit loss	$ 5,900	$ 6,600
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Available for sale, allowance for credit loss	$ 0	$ (22)
Held to maturity, allowance for credit loss	$ 1,199	$ 1,306
Holdings of securities of any one issuer	0.00%	0.00%
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities pledged as collateral	$ 597,000	$ 369,100
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	40,000	44,800
Available for sale, allowance for credit loss	$ 0	$ 0

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- Definition

Percent of holdings of securities of any one issuer, other than the U.S. Government and U.S. agency securities, which exceeded shareholders equity.

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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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.

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