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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 275	$ 350
Amortized cost, After one year but within five years	563	840
Amortized Cost	838	1,190
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	364,051	348,318
Amortized Cost, After one year but within five years	1,004,948	1,223,529
Amortized Cost, After five years but within ten years	11,141	10,331
Amortized Cost, After ten years	27,883	37,242
Amortized Cost	1,408,023	1,619,420
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	275	350
Estimated Fair Value, After one year but within five years	563	840
Estimated Fair Value	838	1,190
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	359,967	341,645
Estimated Fair Value, After one year but within five years	979,225	1,167,973
Estimated Fair Value, After five years but within ten years	10,143	8,851
Estimated Fair Value, After ten years	26,740	35,436
Total debt securities	$ 1,376,075	$ 1,553,905

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