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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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