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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Mar. 31, 2023 USD ($) Investments	Dec. 31, 2022 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	179	179
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 508,311	$ 818,115
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	10,072	29,153
Available-for-sale Securities, 12 Months or Longer, Fair Value	989,448	698,341
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	66,028	64,771
Available-for-sale Securities, Fair Value, Total	1,497,759	1,516,456
Available-for-sale Securities, Unrealized Losses, Total	$ 76,100	$ 93,924
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	71	74
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 501,386	$ 787,925
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	9,684	27,078
Available-for-sale Securities, 12 Months or Longer, Fair Value	958,843	689,939
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	63,308	63,621
Available-for-sale Securities, Fair Value, Total	1,460,229	1,477,864
Available-for-sale Securities, Unrealized Losses, Total	$ 72,992	$ 90,699
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	1	1
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 344
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	1
Available-for-sale Securities, 12 Months or Longer, Fair Value		$ 349
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		1
Available-for-sale Securities, Fair Value, Total	344	349
Available-for-sale Securities, Unrealized Losses, Total	$ 1	$ 1
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	95	92
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 302	$ 10,001
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3	1,239
Available-for-sale Securities, 12 Months or Longer, Fair Value	14,364	5,055
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,770	645
Available-for-sale Securities, Fair Value, Total	14,666	15,056
Available-for-sale Securities, Unrealized Losses, Total	$ 1,773	$ 1,884
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	8	8
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,486	$ 2,308
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	14	184
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,311	464
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	100	37
Available-for-sale Securities, Fair Value, Total	2,797	2,772
Available-for-sale Securities, Unrealized Losses, Total	$ 114	$ 221
Asset backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	1	1
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 13,010
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		361
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 12,363
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	417
Available-for-sale Securities, Fair Value, Total	12,363	13,010
Available-for-sale Securities, Unrealized Losses, Total	$ 417	$ 361
Other Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	3
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 4,793	$ 4,871
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	370	291
Available-for-sale Securities, 12 Months or Longer, Fair Value	2,567	2,534
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	433	467
Available-for-sale Securities, Fair Value, Total	7,360	7,405
Available-for-sale Securities, Unrealized Losses, Total	$ 803	$ 758

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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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Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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