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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 776	$ 350
Amortized cost, After one year but within five years	61	840
Amortized Cost	837	1,190
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	335,108	348,318
Amortized Cost, After one year but within five years	888,721	1,223,529
Amortized Cost, After five years but within ten years	13,369	10,331
Amortized Cost, After ten years	16,770	37,242
Amortized Cost	1,253,968	1,619,420
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	776	350
Estimated Fair Value, After one year but within five years	61	840
Estimated Fair Value	837	1,190
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	330,076	341,645
Estimated Fair Value, After one year but within five years	853,508	1,167,973
Estimated Fair Value, After five years but within ten years	12,354	8,851
Estimated Fair Value, After ten years	14,979	35,436
Total debt securities	$ 1,210,917	$ 1,553,905

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