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Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2022	Dec. 31, 2025	Dec. 01, 2025
Derivative [Line Items]
Derivative instrument, asset amount secured by derivative	$ 1,420,000,000		$ 1,420,000,000			$ 1,500,000,000	$ 1,520,000,000
Derivative, notional amount	4,295,168,000		4,295,168,000			2,392,483,000
Collateral already posted, fair value	0		0			0
Collateral received from third parties	63,400,000		63,400,000			42,900,000
Credit risk derivative liability, fair value, excluding hedge	75,500,000		75,500,000			54,000,000.0
Interest Rate Swap
Derivative [Line Items]
Gain (losses) in fair value adjustments	7,000	$ (9,000)	17,000	$ (25,000)
Derivative term					3 years
Credit default swap
Derivative [Line Items]
Derivative, notional amount	71,200,000		71,200,000			$ 75,800,000
Loss on derivative	721,000		609,000
Premium expense	$ 877,000		$ 1,800,000
Interest Rate Option | Minimum
Derivative [Line Items]
Derivative term			3 years
Interest Rate Option | Maximum
Derivative [Line Items]
Derivative term			5 years

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Credit Risk Derivative Liabilities, At Fair Value, Excluding Hedge

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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Term of derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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