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Investment Securities - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Federal reserve and federal home loan bank stock	$ 27,685,000		$ 28,327,000
Accrued interest, after allowance for credit loss	$ 5,500,000		$ 5,500,000
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		$ 0
Held to maturity, allowance for credit loss	907,000		$ 1,030,000
Proceeds from sales or calls	$ 0	$ 0
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	$ 16,000,000.0		$ 519,600,000
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	$ 36,900,000	$ 38,500,000

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

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