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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 560	$ 776
Amortized cost, After one year but within five years	1	61
Amortized Cost	561	837
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	359,472	335,108
Amortized Cost, After one year but within five years	644,883	888,721
Amortized Cost, After five years but within ten years	12,880	13,369
Amortized Cost, After ten years	14,907	16,770
Amortized Cost	1,032,142	1,253,968
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	560	776
Estimated Fair Value, After one year but within five years	1	61
Estimated Fair Value	561	837
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	356,281	330,076
Estimated Fair Value, After one year but within five years	633,427	853,508
Estimated Fair Value, After five years but within ten years	12,006	12,354
Estimated Fair Value, After ten years	13,666	14,979
Total debt securities	$ 1,015,380	$ 1,210,917

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