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Derivative Instruments and Hedging Activities - Designated as fair value hedges (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Cash Flow Hedging Derivatives
Unwind of fair value hedges on treasury and municipal securities	$ 10,400
Interest Rate Swaps
Cash Flow Hedging Derivatives
Proceeds from termination of interest rate swaps	195,900
Unwind of fair value hedges on treasury and municipal securities	10,400
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swaps
Cash Flow Hedging Derivatives
Notional Amount	$ 45,144	$ 242,314
Weighted Average Pay Rate	3.82%	3.55%
Weighted Average Receive Rate	3.66%	4.20%
Weighted Average Maturity (Years)	13 years 2 months 26 days	14 years 6 months 14 days

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