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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Sep. 30, 2024 USD ($) Investments	Dec. 31, 2023 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	115	155
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 699	$ 6,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3	97
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,259,896	1,436,062
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	33,647	66,004
Available-for-sale Securities, Fair Value, Total	1,260,595	1,442,386
Available-for-sale Securities, Unrealized Losses, Total	$ 33,650	$ 66,101
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	54	68
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 4,838
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		90
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 1,238,833	1,401,669
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	31,363	62,545
Available-for-sale Securities, Fair Value, Total	1,238,833	1,406,507
Available-for-sale Securities, Unrealized Losses, Total	$ 31,363	$ 62,635
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	3
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 699	$ 1,100
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	653
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1
Available-for-sale Securities, Fair Value, Total	1,352	1,100
Available-for-sale Securities, Unrealized Losses, Total	$ 4	$ 3
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	53	74
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 80
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 12,407	13,261
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,230	1,677
Available-for-sale Securities, Fair Value, Total	12,407	13,341
Available-for-sale Securities, Unrealized Losses, Total	$ 1,230	$ 1,677
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	2	6
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 306
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		4
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 796	1,847
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	97	110
Available-for-sale Securities, Fair Value, Total	796	2,153
Available-for-sale Securities, Unrealized Losses, Total	$ 97	$ 114
Asset backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments		1
Available-for-sale Securities, 12 Months or Longer, Fair Value		$ 12,512
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		282
Available-for-sale Securities, Fair Value, Total		12,512
Available-for-sale Securities, Unrealized Losses, Total		$ 282
Other Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 7,207	$ 6,773
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	956	1,390
Available-for-sale Securities, Fair Value, Total	7,207	6,773
Available-for-sale Securities, Unrealized Losses, Total	$ 956	$ 1,390

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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