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Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) derivative | Mar. 31, 2024 USD ($) derivative
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, net liability position, aggregate fair value |  | $ 19,800
Cash collateral received |  | 20,900
Interest rate derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash collateral received | $ 16,939 | $ 19,772
Interest rate derivatives | Derivative Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of outstanding interest rate derivatives | derivative | 6 | 6
Aggregate notional amount | $ 472,500 | $ 472,500
Number of interest rate derivatives entered into during the period | derivative | 5 |
Notional amount of derivatives entered into during the period | $ 1,000,000 |
Number of interest rate derivatives terminated | derivative | 2 |
Aggregate notional amount, terminated | $ 550,000 |
Notional amount of basis adjustments | 4,600 |
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Aggregate notional amount | $ 1,200,000 | $ 1,200,000
Number of derivative instruments held | derivative | 132 | 128
Interest rate caps | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Aggregate notional amount | $ 55,600 | $ 55,600
Number of derivative instruments held | derivative | 2 | 2

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