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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Due within one year, Estimated Fair Value	$ 489
Due after one but within five years, Amortized Cost	17,900
Due after one but within five years, Estimated Fair Value	18,139
Due after five but within ten years, Amortized Cost	53,919
Due after five but within ten years, Estimated Fair Value	50,767
Due after ten years, Amortized Cost	0
Due after ten years, Estimated Fair Value	0
Due within one year, Amortized Cost	72,309
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	490
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	69,395
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,161,904
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,071,405
Amortized Cost	1,234,213	$ 1,138,425
Securities available for sale, at fair value	1,140,800	$ 1,020,986
Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	1,234,213
Securities available for sale, at fair value	1,140,800
US Government Agencies Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	727,200
Securities available for sale, at fair value	688,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Net Investment Income [Line Items]
Amortized Cost	434,700
Securities available for sale, at fair value	$ 383,500

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