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Derivative Financial Instruments - Additional Information (Detail) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) Agreement | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative assets and liabilities offset in balance sheet | $ 0 |  |
Total notional amount of the Company's swaps | $ 409,800,000 |  | $ 425,600,000
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] |  |  |
Total notional amount of the Company's swaps |  | $ 1,000,000,000 |
Weighted average fixed rate |  | 3.80% |
Derivative, Notional Amount | $ 24,900 |  |
Interest-rate Swap Agreements with Customers [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Number of interest-rate swap agreements | Agreement | 123 |  |
Total notional amount of the Company's swaps | $ 409,800,000 |  |

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