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Derivative Instruments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Maximum notional contract amount as percent of total assets	25.00%		25.00%
Interest income, investment securities	$ 46,898,000	$ 55,050,000	$ 94,155,000	$ 113,051,000
Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative, average variable interest rate	1.21%		1.21%		1.21%
Interest income, investment securities			$ 16,000,000.0
Derivative assets, notional amount	$ 1,001,715,000		1,001,715,000		$ 1,001,715,000
Risk Participation Agreements
Derivatives, Fair Value [Line Items]
Derivative, notional amount	22,300,000		22,300,000
Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative liabilities, notional amount	0		0
Derivative assets, notional amount	$ 0		$ 0

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- Definition

Derivative Instrument, Covenant, Maximum Outstanding Notional Contract Amount, Percent Of Assets

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Nominal or face amount used to calculate payments on the derivative asset.

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Average variable interest rate related to the group of interest rate derivatives.

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Nominal or face amount used to calculate payments on the derivative liability.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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