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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Due within one year, Estimated Fair Value	$ 7,198
Due after one but within five years, Amortized Cost	28,465
Due after one but within five years, Estimated Fair Value	29,380
Due after five but within ten years, Amortized Cost	36,105
Due after five but within ten years, Estimated Fair Value	34,116
Due after ten years, Amortized Cost	0
Due after ten years, Estimated Fair Value	0
Due within one year, Amortized Cost	71,752
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	7,182
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	70,694
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,133,375
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,041,015
Amortized Cost	1,205,127	$ 1,267,747
Securities available for sale, at fair value	1,111,709	$ 1,147,623
Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	1,205,127
Securities available for sale, at fair value	1,111,709
US Government Agencies Debt Securities [Member]
Net Investment Income [Line Items]
Amortized Cost	760,100
Securities available for sale, at fair value	715,700
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Net Investment Income [Line Items]
Amortized Cost	373,300
Securities available for sale, at fair value	$ 325,300

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