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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 776	$ 776
Amortized cost, After one year but within five years	1	61
Amortized Cost	777	837
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	339,766	335,108
Amortized Cost, After one year but within five years	828,383	888,721
Amortized Cost, After five years but within ten years	13,579	13,369
Amortized Cost, After ten years	16,011	16,770
Amortized Cost	1,197,739	1,253,968
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	776	776
Estimated Fair Value, After one year but within five years	1	61
Estimated Fair Value	777	837
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	335,452	330,076
Estimated Fair Value, After one year but within five years	804,188	853,508
Estimated Fair Value, After five years but within ten years	12,570	12,354
Estimated Fair Value, After ten years	14,454	14,979
Total debt securities	$ 1,166,664	$ 1,210,917

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