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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Dec. 31, 2024 USD ($) Investments	Dec. 31, 2023 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	126	155
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 92,564	$ 6,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	1,051	97
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,106,088	1,436,062
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	42,083	66,004
Available-for-sale Securities, Fair Value, Total	1,198,652	1,442,386
Available-for-sale Securities, Unrealized Losses, Total	$ 43,134	$ 66,101
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	51	68
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 89,867	$ 4,838
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	1,030	90
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,086,142	1,401,669
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	39,219	62,545
Available-for-sale Securities, Fair Value, Total	1,176,009	1,406,507
Available-for-sale Securities, Unrealized Losses, Total	$ 40,249	$ 62,635
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	5	3
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 681	$ 1,100
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	4	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	500
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	2
Available-for-sale Securities, Fair Value, Total	1,181	1,100
Available-for-sale Securities, Unrealized Losses, Total	$ 6	$ 3
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	63	74
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,214	$ 80
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	15
Available-for-sale Securities, 12 Months or Longer, Fair Value	11,498	13,261
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,757	1,677
Available-for-sale Securities, Fair Value, Total	12,712	13,341
Available-for-sale Securities, Unrealized Losses, Total	$ 1,772	$ 1,677
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	4	6
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 802	$ 306
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2	4
Available-for-sale Securities, 12 Months or Longer, Fair Value	752	1,847
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	138	110
Available-for-sale Securities, Fair Value, Total	1,554	2,153
Available-for-sale Securities, Unrealized Losses, Total	$ 140	$ 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	$ 7,196	$ 6,773
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	967	1,390
Available-for-sale Securities, Fair Value, Total	7,196	6,773
Available-for-sale Securities, Unrealized Losses, Total	$ 967	$ 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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