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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Mar. 31, 2025 USD ($) Investments	Dec. 31, 2024 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	117	126
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 2,656	$ 92,564
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	10	1,051
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,061,820	1,106,088
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	31,181	42,083
Available-for-sale Securities, Fair Value, Total	1,064,476	1,198,652
Available-for-sale Securities, Unrealized Losses, Total	$ 31,191	$ 43,134
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	47	51
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 0	$ 89,867
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	0	1,030
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,041,956	1,086,142
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	28,550	39,219
Available-for-sale Securities, Fair Value, Total	1,041,956	1,176,009
Available-for-sale Securities, Unrealized Losses, Total	$ 28,550	$ 40,249
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	5	5
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 660	$ 681
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	5	4
Available-for-sale Securities, 12 Months or Longer, Fair Value	470	500
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	2	2
Available-for-sale Securities, Fair Value, Total	1,130	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	58	63
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,194	$ 1,214
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3	15
Available-for-sale Securities, 12 Months or Longer, Fair Value	11,437	11,498
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,536	1,757
Available-for-sale Securities, Fair Value, Total	12,631	12,712
Available-for-sale Securities, Unrealized Losses, Total	$ 1,539	$ 1,772
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	4	4
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 802	$ 802
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2	2
Available-for-sale Securities, 12 Months or Longer, Fair Value	761	752
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	126	138
Available-for-sale Securities, Fair Value, Total	1,563	1,554
Available-for-sale Securities, Unrealized Losses, Total	$ 128	$ 140
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	$ 7,196
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	967	967
Available-for-sale Securities, Fair Value, Total	7,196	7,196
Available-for-sale Securities, Unrealized Losses, Total	$ 967	$ 967

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