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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 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	1,063	369
Amortized cost, After five years but within ten years	546	562
Amortized cost, After ten years	2	2
Amortized Cost	1,911	1,428
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	211,927	411,256
Amortized Cost, After one year but within five years	289,140	313,416
Amortized Cost, After five years but within ten years	6,359	7,524
Amortized Cost, After ten years	41,361	41,378
Amortized Cost	548,787	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	1,060	370
Estimated Fair Value, After five years but within ten years	549	565
Estimated Fair Value, After ten years	2	3
Estimated Fair Value	1,911	1,433
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	211,804	410,327
Estimated Fair Value, After one year but within five years	294,436	311,924
Estimated Fair Value, After five years but within ten years	9,206	7,685
Estimated Fair Value, After ten years	38,218	40,768
Total debt securities	$ 553,664	$ 770,704

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