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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) Agreement | Dec. 31, 2023 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative assets and liabilities offset in balance sheet |  | $ 0 |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 363,400 | $ 394,400
Description of Conditions Relating to Clearing of Interest rate Swaps |  | These instruments contain language outlining collateral pledging requirements for each counterparty, in which collateral must be posted if market value exceeds certain agreed upon threshold limits. Cash or securities are pledged as collateral. |
Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | $ 1,000,000 | $ 300,000 |
Remaining Maturity Year | 4 years |  |
Remaining Maturity | 5 years |  |
Weighted average fixed rate | 3.80% |  |
Fixed interest rate |  | 3.95% |
Total fair value of instruments |  | $ 7,200 |
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 300,000 |
Weighted average fixed rate |  | 4.20% |
Interest-rate Swap Agreements with Customers [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Number of interest-rate swap agreements | Agreement |  | 109 |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 363,400 |
Interest rate swaps | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | 700,000 |
Interest rate swaps | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 300,000 |

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