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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Sep. 30, 2025 USD ($) Investments	Dec. 31, 2024 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	98	126
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,235	$ 92,564
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	5	1,051
Available-for-sale Securities, 12 Months or Longer, Fair Value	911,809	1,106,088
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	17,660	42,083
Available-for-sale Securities, Fair Value, Total	913,044	1,198,652
Available-for-sale Securities, Unrealized Losses, Total	$ 17,665	$ 43,134
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	36	51
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 89,867
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		1,030
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 892,559	1,086,142
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	15,489	39,219
Available-for-sale Securities, Fair Value, Total	892,559	1,176,009
Available-for-sale Securities, Unrealized Losses, Total	$ 15,489	$ 40,249
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	6	5
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 724	$ 681
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	5	4
Available-for-sale Securities, 12 Months or Longer, Fair Value	409	500
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	2	2
Available-for-sale Securities, Fair Value, Total	1,133	1,181
Available-for-sale Securities, Unrealized Losses, Total	$ 7	$ 6
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	51	63
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 11	$ 1,214
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		15
Available-for-sale Securities, 12 Months or Longer, Fair Value	10,917	11,498
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,212	1,757
Available-for-sale Securities, Fair Value, Total	10,928	12,712
Available-for-sale Securities, Unrealized Losses, Total	$ 1,212	$ 1,772
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	4
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 500	$ 802
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		2
Available-for-sale Securities, 12 Months or Longer, Fair Value	766	752
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	114	138
Available-for-sale Securities, Fair Value, Total	1,266	1,554
Available-for-sale Securities, Unrealized Losses, Total	$ 114	$ 140
Other Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	2	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 7,158	$ 7,196
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	843	967
Available-for-sale Securities, Fair Value, Total	7,158	7,196
Available-for-sale Securities, Unrealized Losses, Total	$ 843	$ 967

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