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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 300	$ 495
Amortized cost, After one year but within five years	1,058	369
Amortized cost, After five years but within ten years	543	562
Amortized cost, After ten years	2	2
Amortized Cost	1,903	1,428
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	186,373	411,256
Amortized Cost, After one year but within five years	252,519	313,416
Amortized Cost, After five years but within ten years	5,873	7,524
Amortized Cost, After ten years	40,317	41,378
Amortized Cost	485,082	773,574
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	300	495
Estimated Fair Value, After one year but within five years	1,055	370
Estimated Fair Value, After five years but within ten years	546	565
Estimated Fair Value, After ten years	2	3
Estimated Fair Value	1,903	1,433
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	186,539	410,327
Estimated Fair Value, After one year but within five years	257,430	311,924
Estimated Fair Value, After five years but within ten years	6,008	7,685
Estimated Fair Value, After ten years	39,746	40,768
Total debt securities	$ 489,723	$ 770,704

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